| 单词 | micrometer |
| 例句 | Acererak made a final, desperate move to avoid my charge and dropped a micrometer too low. Ready Player One: A Novel 2011-08-16T00:00:00Z Then I magnified both images on my display and studied every micrometer. Ready Player One: A Novel 2011-08-16T00:00:00Z Added up, all the layers are less than 40 micrometers, or about half the thickness of a human hair, researcher Philippe Walter said Friday. French scientists crack secrets of Mona Lisa 2010-07-16T16:06:00Z “Each edit had been painstakingly measured with a micrometer. That was partly how the unique metronomic quality of Metallica’s double beater kick drum sound was achieved.” Solving the Riddle of Metallica 2018-11-15T05:00:00Z These laces measured a full three microns thick, according to my micrometer. Style Invitational Week 1325: Stand up and jeer — jokes for the WHCA dinner 2019-03-28T04:00:00Z These organs are not yet suitable to be transplanted into humans, as the tubular vessels are 75 micrometers — much larger than human capillaries. “Disappearing ink” could give 3D printed organs a blood supply 2014-03-07T19:34:00Z Together with the team, he analyzed it by first cutting a very thin slice about 50 micrometers thick and then gluing it onto glass. Alpine rock reveals dynamics of plate movements in Earth's interior 2023-10-27T04:00:00Z Given that polarons can last for about 11 nanoseconds, the team thinks the exciton-polarons could cover more than 25 micrometers at a time. A superatomic semiconductor sets a speed record 2023-10-26T04:00:00Z As a result, for the first time, the team were able to use light to produce polystyrene latexes with particle sizes greater than one micrometer and with highly uniform diameters. Achieving large and uniform particle sizes 2023-10-25T04:00:00Z "Essentially, our synthesis surface becomes a canvas for painting with DNA molecules at the micrometer scale," says Jory Lietard, PI in the Institute of Inorganic Chemistry. Art with DNA -- Digitally creating 16 million colors by chemistry 2023-10-17T04:00:00Z Specifically, they employed a silicon distorted photonic crystal with a primal lattice constant of 200 micrometers and terahertz waves. Photonic crystals bend light as though it were under the influence of gravity 2023-10-16T04:00:00Z This was achieved by irradiating the film with an optical vortex, resulting in prints of exceptional positional accuracy at the micrometer scale. Next-generation printing: Precise and direct, using optical vortices 2023-10-02T04:00:00Z By comparison, the width of a single human hair is approximately 60 micrometers, according to California’s health department. N95 Masks Helped Protect Against the Coronavirus. They Also Work Against Wildfire Smoke. 2023-06-07T04:00:00Z A human hair is 50 to 70 micrometers wide. WA wants permanent rules for working outdoors in wildfire smoke 2023-05-29T04:00:00Z The ciliates, which include Paramecium and Tetrahymena, are a group of protists 10 to 3,000 micrometers in length that are covered in rows, tufts, or spirals of tiny cilia. Fundamentals of Biology 2015-01-01T00:00:00Z Single protist cells range in size from less than a micrometer to the 3-meter lengths of the multinucleate cells of the seaweed Caulerpa. Concepts of Biology 2013-04-25T00:00:00Z The new APS’s beam will measure 3 micrometers high and 15 micrometers wide—less than the width of a human hair. A farewell to the x-ray–generating particle accelerator that was my father’s baby 2023-05-03T04:00:00Z But where the polarity of undulator fields alternates over a few centimeters, the laser’s field seesaws along with the wavelength of the light—just 1 micrometer. Compact x-ray laser would shrink billion-dollar machines to the size of a room 2023-03-22T04:00:00Z It has a diameter of no more than 2.5 micrometers, one-thirtieth the width of a human hair, and can become embedded in the lungs. Biden Administration Moves to Tighten Limits on Deadly Air Pollution 2023-01-06T05:00:00Z For instance, the soma of a neuron can vary in size from 4 to 100 micrometers in diameter. Fundamentals of Biology 2015-01-01T00:00:00Z PM10 particles are particles smaller than 10 micrometers, or 10 one-millionths of a meter that are so-called coarse particles that can irritate the eyes, nose and throat. North Macedonia takes emergency anti-pollution steps 2022-12-25T05:00:00Z These unmyelinated spaces are about one micrometer long and contain voltage gated Na+ and K+ channels. Biology for AP Courses 2022-06-09T00:00:00Z Sunlight reflected at a wavelength of 2 micrometers is shown as blue, sunlight reflected at 3 micrometers is shown as green, and heat radiated from Saturn’s interior at 5 micrometers is red. Astronomy 2016-10-13T00:00:00Z Most cells range from 5 to 50 micrometers in diameter. Miller & Levine Biology 2018-01-01T00:00:00Z The nucleus ranges from 3 to 18 micrometers in diameter. Fundamentals of Biology 2015-01-01T00:00:00Z EPA is concerned about particles that are 10 micrometers in diameter or smaller because those are the particles that generally pass through the throat and nose and enter the lungs. Environmental Biology 2018-09-06T00:00:00Z The neuronal cell body that maintains that long fiber must be quite large, possibly several hundred micrometers in diameter, making it one of the largest cells in the body. Anatomy and Physiology 2013-06-19T00:00:00Z For example, Saturn’s rings reflect sunlight at 2 micrometers, but not at 3 and 5 micrometers, so they appear blue. Astronomy 2016-10-13T00:00:00Z In darkness and humidity, fungi sat in the laboratory for days, all the while electrical charges fired along thin, thread-like structures smaller than 30 micrometers in diameter called hyphae. It's not a bad trip: Mushrooms may be "talking" to each other, new study finds 2022-04-13T04:00:00Z Axons and dendrites in the central nervous system are typically only about a micrometer thick, while some in the peripheral nervous system are much thicker. Fundamentals of Biology 2015-01-01T00:00:00Z The process lets scientists see a very thin section of the rock that is just a few micrometers thick. Plant fossils found in San Juan Islands like ‘finding a penguin in North America’ 2022-02-18T05:00:00Z Axon diameters can be as small as 1 to 20 micrometers. Anatomy and Physiology 2013-06-19T00:00:00Z It offers stronger evidence than previous analyses covering fewer people, which also found that low levels of the small particles, measuring no more than 2.5 micrometers wide, pose health risks. News at a glance: Mysterious space filaments, damaged dinosaur tracks, and edible worms 2022-02-02T05:00:00Z The museum notes that it’s four times sharper than the last scan that was put out by the museum, which was only 44.8 gigapixels big, and where each pixel represented a comparatively massive 20 micrometers. Obscenely detailed scan lets you peer at Rembrandt’s Night Watch masterpiece online 2022-01-11T05:00:00Z The soma is usually about 10–25 micrometers in diameter and often is not much larger than the cell nucleus it contains. Fundamentals of Biology 2015-01-01T00:00:00Z “The best athletes in the world,” Horween said, “can tell you the subtle differences in ways that you have to measure with a micrometer and equipment. They can just feel it.” Inside look at how pieces of cowhide are transformed into NBA game balls 2021-12-19T05:00:00Z Because a micrometer is 1/1000 of a millimeter, this means that the length of a myelin sheath can be 100–1000 times the diameter of the axon. Anatomy and Physiology 2013-06-19T00:00:00Z They would park one in a large orbit 4 millimeters wide while they measured the other twirling in an orbit 40 micrometers across in the trap’s center, swapping them every 10 minutes. Particle drag race leads to most precise estimate yet of the proton’s mass 2021-11-30T05:00:00Z The amount of davemaoite in the Botswanan diamond was extremely small, with each of three specks measuring only about five to 10 micrometers wide. New Mineral Discovered in Deep-Earth Diamond 2021-11-11T05:00:00Z Because of this, no cell is very far from a capillary, no more than 50 micrometers away. Fundamentals of Biology 2015-01-01T00:00:00Z Researchers pay particularly close attention to particles less than 2.5 micrometers, which is small enough that about 20 could fit into the width of a human hair. Wildfire smoke exposure linked to preterm births, study says 2021-08-27T04:00:00Z As their own lumen averages just 30 micrometers or less, arterioles are critical in slowing down—or resisting—blood flow. Anatomy and Physiology 2013-06-19T00:00:00Z PM 2.5, or particulate matter measuring 2.5 micrometers across, can irritate lungs, cause inflammation, alter immune function and increase susceptibility to respiratory infections. Some COVID deaths are linked to Western wildfires, study shows 2021-08-14T04:00:00Z Researchers pay particularly close attention to particles smaller than 2.5 micrometers, which are tiny enough that about 20 could fit into the width of a human hair, according to Carvlin. Heat, smoke and COVID: A public health ‘perfect storm’ 2021-08-13T04:00:00Z But we should be prepared for this to be the type of game where staring down the abyss lowers the entertainment levels to reading the manual of a micrometer screwgauge. Brighton v Newcastle: Premier League – live! 2021-03-20T04:00:00Z If, that is, they are not excessively serious about religion, with excess to be determined by government officials measuring such things with some unspecified theological micrometer. Opinion | Maine likes not-too-religious schools 2021-03-16T04:00:00Z With a lumen averaging 30 micrometers or less in diameter, arterioles are critical in slowing down—or resisting—blood flow and, thus, causing a substantial drop in blood pressure. Anatomy and Physiology 2013-06-19T00:00:00Z Contributing to the problem is the density of the sediment, which approaches something like flourless chocolate cake: the pore size is an estimated 0.02 micrometers. 100-Million-Year-Old Seafloor Sediment Bacteria Have Been Resuscitated 2021-03-04T05:00:00Z The algal cell pictured here in red, a Coscinodiscus diatom, is 90 micrometers across, or one tenth the width of a ballpoint pen’s tip. Even Tiny Phytoplankton Have Microbiomes 2021-02-19T05:00:00Z The European Commission’s Copernicus satellite monitoring program said measured levels of particles smaller than 10 micrometers - so-called PM10s - spiked in cities such as Barcelona, Lyon and Marseille on Sunday. Plume of Sahara dust caused spike in European air pollution 2021-02-09T05:00:00Z This particulate matter is known as PM2.5 as the particles are less than 2.5 micrometers in diameter – or about 30 times smaller than the diameter of the average human hair. 'Invisible killer': fossil fuels caused 8.7m deaths globally in 2018, research finds 2021-02-09T05:00:00Z The diameter of a capillary lumen ranges from 5–10 micrometers; the smallest are just barely wide enough for an erythrocyte to squeeze through. Anatomy and Physiology 2013-06-19T00:00:00Z The particles are not visible: 90 percent of them are less than one micrometer in diameter. Cutting Diesel Exhaust Could Lessen COVID Spread in Cities 2020-11-12T05:00:00Z Measuring three micrometers in diameter the bacteria used were about 30 times larger than coronavirus particles, but the results were likely to be relevant to Covid-19 nevertheless, independent researchers said. The face mask test: which are the best at limiting the spread of Covid? 2020-10-30T04:00:00Z “Using digital holography, the instrument obtains the images in a non-contact manner, resolving particles larger than ten micrometers in size in a sensing volume of approximately three cubic centimeters.” Army teams with universities to create miniature drone device that detects aerosols 2020-10-18T04:00:00Z Dr. Stepanauskas said that because of their extremely petite size, picozoa — which are less than three micrometers across, or about one-thirtieth the width of a human hair — might eat only viruses. Nothing Eats Viruses, Right? Meet Some Hungry Protists 2020-09-24T04:00:00Z In terms of scale, the diameter of an arteriole is measured in micrometers compared to millimeters for elastic and muscular arteries. Anatomy and Physiology 2013-06-19T00:00:00Z The most prevalent pollutant by mass is particulate matter less than 2.5 micrometers in diameter, roughly 50 times smaller than a grain of sand. What’s in Wildfire Smoke, and Why Is It So Bad for Your Lungs? 2020-09-10T04:00:00Z "Cell pellets of 1,000 micrometer diameter would be able to survive the shortest travel time in space." Bacteria on the outside of the International Space Station survived for years in the vacuum of space 2020-08-30T04:00:00Z In eukaryotic cells, including our own, such “redox” reactions take place on the inner membrane of the mitochondria, and the distances involved are tiny—just micrometers. ‘Electric mud’ teems with new, mysterious bacteria 2020-08-19T04:00:00Z Air pollution is usually measured in volumes of small particles of soot as small as 2.5 micrometers in diameter. Living Near an Airport May Raise Risks of Preterm Birth 2020-08-11T04:00:00Z In terms of scale, the diameter of a venule is measured in micrometers compared to millimeters for veins. Anatomy and Physiology 2013-06-19T00:00:00Z The new machine will circulate a ribbonlike beam 2 micrometers high and 20 micrometers wide, one-thirtieth as wide as the old beam. Rebirth of leading European facility promises revolutionary advances in x-ray science 2020-07-15T04:00:00Z Each of the grooves is a few micrometers wide. Why Is This Chocolate Shimmering Like a Rainbow? 2020-05-21T04:00:00Z Other work narrowed down the conductor’s size, suggesting it had to be at least 1 micrometer in diameter. ‘Electric mud’ teems with new, mysterious bacteria 2020-08-19T04:00:00Z PM 2.5 refers to the width of the airborne particles: 2.5 micrometers or less, a small fraction of the width of a human hair. ‘A Terrible Price’: The Deadly Racial Disparities of Covid-19 in America 2020-04-29T04:00:00Z Just 100 micrometers wide, the rims are too small for older techniques to isolate and measure, but the QDM revealed a weak relic magnetism. Diamond microscope reveals slow crawl of Earth’s ancient crust 2020-04-22T04:00:00Z In addition, particles below 20 micrometers behave differently than larger particles. A video uses lasers to show how you spit when you talk 2020-04-17T04:00:00Z In their study, the researchers modeled the airborne movement of aerosol particles smaller than 20 micrometers, noting that the particle size for a dry cough is typically less than 15 micrometers. Chilling video reveals how coronavirus spreads from a single cough in a supermarket 2020-04-09T04:00:00Z The grains are small, measuring from 2 to 30 micrometers in size. Oldest stuff on Earth found inside meteorite that hit Australia 2020-01-13T05:00:00Z The new research found plastic as tiny as 10 micrometers, which is smaller than the width of a human hair. Oceans contain a million times more microplastic than we realized, alarming study claims 2019-12-04T05:00:00Z At scales of a few micrometers a bacterium, for instance, is easily lofted into the jumble of atmospheric molecules. The Atmospheric Microbiome 2019-09-14T04:00:00Z Just a few micrometers thick—comparable to neurons themselves—these tools may soon capture unprecedented long-term recordings from hard-to-reach parts of animal brains. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z They also contain polymers or other substances that, because of their chemical makeup, radiate away additional heat as mid-IR light, at wavelengths of 8 to 13 micrometers. Cooling paint drops the temperature of any surface 2018-09-27T04:00:00Z A micrometer is a one-thousandth of a millimeter or about 0.000039 of an inch. Oldest stuff on Earth found inside meteorite that hit Australia 2020-01-13T05:00:00Z This time she is collecting smaller particles, down to 20 micrometers in diameter. Earth Has a Hidden Plastic Problem--Scientists Are Hunting It Down 2018-08-13T04:00:00Z Measuring in at a minuscule 2.5 micrometers, these particles are a tiny fraction of the width of a human hair. To kill climate rule, Trump's EPA wants to redefine danger of soot 2018-08-06T04:00:00Z In a standard grid known as the Utah array, each spike is roughly 200 micrometers thick at its base. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z She felt that women had a gift for observational astronomy: “The eye that directs a needle in the delicate meshes of embroidery will equally well bisect a star with the spider web of the micrometer.” Maria Mitchell at 200: a pioneering astronomer who fought for women in science 2018-06-17T04:00:00Z Most are less than a millimeter across and some are as tiny as the largest fungal spores – just 100 micrometers across. Tiny Orchid Seeds Possess Understated Beauty and, Occasionally, Tools 2018-06-16T04:00:00Z In 1997, when they crafted the National Ambient Air Quality Standards, they included a standard for fine particulate matter, 2.5 micrometers in diameter or smaller. Scientists denounce Pruitt’s effort to block ‘secret science’ at EPA 2018-04-25T04:00:00Z Simon Gröblacher, a physicist at Delft University of Technology in the Netherlands and his colleagues etched beams about 10 micrometers long into silicon chips. Einstein’s ‘spooky action at a distance’ spotted in objects almost big enough to see 2018-04-25T04:00:00Z So her team is developing much smaller electrodes using rigid carbon fibers roughly 8 micrometers in diameter. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z Inside were tiny diamonds that likely measured up to 100 micrometers across when they originally formed. Diamond-studded meteorites came from the collision of a lost planet 2018-04-17T04:00:00Z This is a classic case of measuring with a micrometer, marking with a magic marker and cutting with a chain saw. Trump Hits China With Stiff Trade Measures 2018-03-22T04:00:00Z On top of a microchip, the researchers etch two gratings of metal stripes just micrometers apart. Weird vibrations poised to control quantum computers 2018-03-14T04:00:00Z The softened tooth is then sliced into sections eight micrometers thick. Tooth-aging program aids wildlife management 2018-01-31T05:00:00Z Researchers typically advance their probes a few micrometers farther every day to capture signals from a new set of cells as their previous targets get damaged or pushed away. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z The artificial skin is only 3.5 micrometers thick—about the same width as a single thread of spider silk—and consists of a tiny magnetic field sensor sandwiched between two layers of film. Watch this wearable electronic skin control virtual objects 2018-01-19T05:00:00Z A micrometer is one millionth of a meter. Season's micro-greetings: Scientists claim smallest Christmas card 2017-12-17T05:00:00Z These ads, however, often come within a micrometer of overtly advocating for or against a candidate. Statehouses, Not Congress, Hosting Biggest Political Money Fights 2017-08-31T04:00:00Z They released tiny pieces of plastics — between 10 and 600 micrometers in diameter — in the water, to see whether the larvaceans ate them. Tiny bits of plastic get to the seafloor by hitching rides on snot palaces 2017-08-16T04:00:00Z His group made precise recordings of the minute forces that probes ranging in diameter from 13 to 200 micrometers exerted as they penetrated a living mouse brain. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z It’s bleached and sifted to a micrometer that meets pro beach volleyball standards. A week with Hogs 2.0: Redskins’ O-line does yoga, eats vegan and trains insanely hard 2017-07-21T04:00:00Z The NPL said that the previous smallest Christmas card measured 200 x 209 micrometers, making their effort over 100 times smaller. Season's micro-greetings: Scientists claim smallest Christmas card 2017-12-17T05:00:00Z The environmental website Treehugger.com noted that the timing of the video coincided with a sharp increase in readings for PM10, suspended particles 10 micrometers or less in diameter. Video of Smog Engulfing Beijing Shows Extent of Pollution 2017-01-03T05:00:00Z "We're seeing feathers still attached to the tail, and we can see how they attach, the shapes that they have down to the micrometer scale, and things like pigment patterns within the feathers," McKellar said. Remarkable feathered dinosaur tail found in chunk of amber 2016-12-08T05:00:00Z At probe sizes 25 micrometers and below, microscopy showed virtually no tearing of blood vessels. Slender, neuron-size probes aim for better recordings of brain’s electrical chatter 2019-05-01T04:00:00Z North Carolinians will watch with bated breath as Burr, measuring with a moral micrometer, carefully calibrates how to adjust his support to Trump’s unfolding repentance. Donald Trump is the GOP’s chemotherapy 2016-10-10T04:00:00Z A micrometer is one millionth of a meter. Season's micro-greetings: Scientists claim smallest Christmas card 2017-12-17T05:00:00Z The particles, known as PM 2.5 because they are 2.5 micrometers in diameter or smaller, are also typical in diesel emissions, among other things. Blazes in Southeast Asia May Have Led to Deaths of Over 100,000, Study Says 2016-09-19T04:00:00Z Those nanogrooves lie within larger troughs that measure about 1.5 micrometers deep and 3 micrometers wide, a good size to snag fog droplets from the air. Video: This desert moss can water itself with fog 2016-06-06T04:00:00Z They simply hammered large silicon particles down to the micrometer scale and then wrapped them in thin carbon sheets made from graphene. How to build a better battery through nanotechnology 2016-05-26T04:00:00Z The electronic skin is less than 2 micrometers thick. Novel E-Skin May Monitor Health, Vital Signs 2016-04-18T04:00:00Z The NPL said that the previous smallest Christmas card measured 200 x 209 micrometers, making their effort over 100 times smaller. Season's micro-greetings: Scientists claim smallest Christmas card 2017-12-17T05:00:00Z Using one cubic micrometer as the volume of a single bacterium, they made their estimates based on the volume of the organs that contain microbes, along with the likely concentrations of bacteria in each place. 40 Trillion Bacteria on and in Us? Fewer Than We Thought. 2016-02-15T05:00:00Z Particles range in size from 100 micrometers down to 100 nanometers in size. Boulder scientists get chance to work on lunar dust 2015-10-10T04:00:00Z The materials—noncylindrical cousins of carbon nanotubes, composed of chains of carbon atoms less than a micrometer wide—are used in making composite materials, chemical catalysts, and even scanning probe microscopes. A carbon capture strategy that pays 2015-08-19T04:00:00Z Greenpeace East Asia did not provide comparisons for other pollutants, such as carbon monoxide, nitrogen dioxide, and ozone, or for levels of particulate matter over 10 micrometers in diameter, known as PM10. China's air less polluted in first half of 2015: Greenpeace 2015-07-22T04:00:00Z So, to make sure their artificial muscles were quick-acting, the researchers used spore layers that were extremely thin—no more than 3 micrometers thick, or about 5 spores deep on average, Sahin says. Energy harnessed from humidity can power small devices 2015-06-16T04:00:00Z One of them, Kikiki huna, is believed to be the smallest flying insect, with a body length as short as about 160 micrometers in some females. Next to Fairyflies, Ants Are Giants 2015-05-25T04:00:00Z They also used satellite data to measure particulate matter smaller than 2.5 micrometers, or PM 2.5, a form of pollution that easily enters the lungs and bloodstream. Air Pollution Tied to Brain Aging 2015-04-28T04:00:00Z Fairbanks ranked No. 7 last year on the American Lung Association list of dirtiest cities based on fine particulate measuring 2.5 micrometers in diameter or less. EPA changes air monitoring location in Fairbanks 2015-04-19T04:00:00Z "A simple collection device is currently available which selectively collects the micrometer aerosol particles on a filter and enables further laboratory investigation of possible drug content," he explained. Breath Test for Illegal Drugs Instead of Urine Analysis? 2015-03-10T04:00:00Z The investigators focused on a type of air pollution called fine particulate matter -- particles of pollution smaller than 2.5 micrometers in diameter. Air Pollution Linked to Increased Stroke Risk, Study Says 2015-03-06T05:00:00Z Nano batteries can recharge fast and store a lot of energy, but they also fail fast. Nano batteries use extremely small structures - less than 100 nanometers as compared to 5-20 micrometers for conventional battery designs. Mollusk Biology Opens Door To Rechargeable Battery Efficiency 2015-02-27T05:00:00Z At 60 micrometers, it is among the smallest silk glands ever observed and is covered in microscopic spigots that produce a low-viscosity liquid silk. Spider spins electrically charged silk 2015-01-27T05:00:00Z The DEP plans to measure airborne fine particles 2.5 micrometers in diameter - 30 times smaller than the diameter of a human hair. State eyes air study near fracking sand facility 2014-12-13T05:00:00Z The top three layers—two thicker SiO2 layers separated by a thick HfO2 layer—acted as the radiator, absorbing heat from below and reemitting the energy at wavelengths between 8 and 13 micrometers. A new way to cool 2014-11-26T05:00:00Z There is a lot to do: hospital drills, 911 emergency operator guidelines, quarantine rules, even details such as checking that plastic body bags meet the minimal thickness - 150 micrometers - recommended by the U.S. Cities, states scramble after Ebola missteps in Dallas expose planning gaps 2014-10-11T04:00:00Z Scientists believed that microscopes using light would never be able to clearly show objects less than 0.2 micrometers, and other types of microscopes required killing the specimen. Nobel chemistry laureate’s twisting path to molecular microscope breakthrough For years, scientists believed that the resolution of optical microscopy was limited to half a wavelength of light, or 0.2 micrometers. Nobel Prize in chemistry honors scientists who saw beyond the limits of light 2014-10-08T04:00:00Z The treatment killed tumor cells but spared healthy cells just a few micrometers away. Dog Study Suggests Bacteria as Cancer Fighter 2014-08-13T04:00:00Z Typically this infrared radiation occurs over a broad range of wavelengths between 6 and 30 micrometers. A new way to cool 2014-11-26T05:00:00Z The rate of deposition is extremely slow, as little as one or two micrometers a year in some areas, a tiny fraction of the thickness of a human hair. Search for Missing Jet Will Move Southwest, Officials Say 2014-06-17T04:00:00Z PM 2.5 refers to particulate matter less than 2.5 micrometers in diameter, which is believed to pose the greatest health risk because it penetrates deeply into lungs. Cities in India Among the Most Polluted, W.H.O. Says 2014-05-08T17:01:07Z But Mr. Redden flinched when Mr. Lera showed him a micrometer that could measure the thickness of the stamp. The ‘Mona Lisa’ of Stamps to Be Auctioned at Sotheby’s 2014-05-02T03:58:36Z Fully extended adult mites are around 600 micrometers long, about 12 times their width. New Worm-Like Mite Features Extraordinary Upholstery 2014-03-31T21:06:12Z Scale bar 500 micrometers in F, 75 micrometers in G. Click image for source. Fool's Gold Preserves Tiny, Ancient Crustacean 2014-03-27T19:34:28Z PM is described by the size of the particles, measured in micrometers or microns. Should public transportation be free in cities with bad air quality? 2014-03-14T11:53:54Z At 1.5 micrometers long, it is comparable in size to a small bacterium. Giant Virus Resurrected from 30,000-year-old Ice 2014-03-04T05:00:00Z Measuring 1.5 micrometers long, the viruses are 25 percent bigger than any virus previously found. Matter: Out of Siberian Ice, a Virus Revived 2014-03-03T21:19:37Z On the other hand, consider that, at a few hundred micrometers long, this complex multicellular arthropod is roughly the same size as some large single-celled microbes like amoebae. New Worm-Like Mite Features Extraordinary Upholstery 2014-03-31T21:06:12Z This refers to particulate matter less than 2.5 micrometers in diameter, which is believed to pose the greatest health risk because it penetrates deeply into lungs. Beijing’s Bad Air Would Be Step Up For Smoggy Delhi 2014-01-25T23:23:46Z When he took over, he used tools — a micrometer and caliper — to show how small tolerances are measured, just as they would be in a factory. Executive profile: Molding future factory workers 2013-09-23T05:00:00Z The 184 participants in Byrnes’ study were then given 25 micrometers of capsaicin, the active component of chili peppers that elicit the burning, stinging sensation we perceive to be “hot spice.” Personality Predicts Liking For Spice: Why Taco Bell's Fiery Doritos Locos Tacos Hits The Mark 2013-09-12T16:22:00Z Feyman’s challenge ignited the field of microelectromechanical systems: machines with both electrical and mechanical parts, built on the scale of one thousandth of a millimetre, a micrometer. Scicurious Guest Writer! Quantum Machines Become Reality 2013-08-28T13:15:08Z Furthermore, the Clean Air Act regulates only particulates smaller than 10 micrometers, more popularly known as PM 10. How Global Warming is Spreading Toxic Dust 2013-07-30T15:15:03.433Z It’s so large that if you knew only its size—about a micrometer, or a millionth of a meter, across—and the complexity of its genome, you’d swear you were talking about a bacterium. Meet the Supersize Pandoravirus 2013-07-19T10:50:29Z Each slice was 20 micrometers thick, roughly the width of a sheet of plastic wrap. Scientists create detailed 3-D model of human brain 2013-06-22T20:41:00Z It shows the brain at a resolution of 20 micrometers — 50 times higher than the typical 1 millimeter resolution of atlases based on whole-brain scans. Whole Human Brain Mapped in 3D 2013-06-21T18:15:00.147Z Next, they used a machine called a microtome to cut the brain into 7,400 ultra-thin slices, each just 20 micrometers thick. Ultra-high resolution 3D map of a human brain 2013-06-20T18:39:23Z A study reported average arsenic concentrations of 40 parts per million in dust fractions smaller than 50 micrometers. How Global Warming is Spreading Toxic Dust 2013-07-30T15:15:03.433Z The ministry did not provide data for PM2.5, or airborne particulate matter with a diameter of less than 2.5 micrometers, a major health hazard caused by industrial coal burning and vehicle emissions. China Says Rural Environment Problems Worsen in 2012 2013-06-04T13:15:02.970Z Health researchers consider airborne soot particles smaller than 2.5 micrometers a major health threat, causing lung disease and premature death. New Agreement Casts Spotlight on Efforts to Inventory Black Carbon 2013-05-31T16:45:00Z The sensor's probe is one millimeter wide, two millimeters long and 300 micrometers thick. In the Fog of Battle Acoustic Sensors Pinpoint Gunfire by Measuring Air Movement 2013-04-30T11:15:00.193Z In early 2012, amid growing public outrage about air quality in the capital city, Beijing began announcing publicly the amount of tiny pollution particles in the air that measure 2.5 micrometers or less in diameter. In China, public anger over secrecy on environment 2013-03-10T03:30:22Z On Wednesday morning the concentration of particles smaller than 10 micrometers in diameter soared briefly on the city’s west side to nearly 1,000 micrograms per cubic meter. Sandstorms Add to China's Air Misery 2013-02-28T08:20:00Z Pollution in Beijing regularly exceeds 500 on an index that measures particulate matter in the air with a diameter of 2.5 micrometers. Less Bang for Beijing New Year Due to Smog 2013-02-01T14:15:05.417Z The eukaryotic cell is comparatively large: roughly 10 micrometers on a side. Archaebacteria: The Third Domain of Life Missed by Biologists for Decades 2013-01-01T00:45:00.170Z Fine particulate matter measuring less than 2.5 micrometers in diameter, or one-thirtieth the width of a human hair, ranks as the country’s most widespread deadly pollutant. EPA tightens soot rules by 20 percent 2012-12-14T18:05:00Z With thousands of kinesins rumbling along multiple microtubules, a droplet that is 100 micrometers across spontaneously begins rolling when it touches a flat surface. Lab-Made Droplets Move Themselves Continuously without External Force 2012-11-07T22:45:00.203Z But PT003 delivers them together, bound to particles with a diameter of less than 5 micrometers. Therapeutics: Strength in numbers 2012-09-26T17:22:52.530Z For aerosols measuring about 0.15 micrometers across, the salty core accounted for as much as 20% of the particle’s weight; in larger aerosols, the fraction of weight due to the core was much smaller. Amazon Seeds Its Own Rain 2012-08-30T19:05:00Z In a second proof-of-principle demonstration, they measured the masses of molecules of the antibody human immunoglobulin M landing on a similar bridge 10 micrometers long, 300 nanometers wide, and 160 nanometers thick. Tiny Mechanical Scale Weighs Molecules One at a Time 2012-08-29T18:24:58Z Those scales are arranged like tiles on a roof, except they measure a mere tens of micrometers across. Shiny! On the Iridescence of Squid 2012-08-25T22:45:00.177Z But, she notes, people with perfect vision can’t discern objects smaller than 20–30 micrometers. Highest Possible Resolution Color Images Achieved 2012-08-13T14:45:00.693Z The behind-the-scenes tweaking of the proposed soot standards, which affect particles measuring less than 2.5 micrometers in diameter, sparked criticism that the White House was interfering with science-based decisions. White House weakened EPA soot proposal, documents show 2012-07-17T22:46:13Z “It vibrated the ground by two micrometers, or two millionths of a meter, which is not very much,” said William Menke, a seismologist and professor of earth and environmental sciences at Columbia. Palisades Rockfall Mars Landscape Along Hudson 2012-06-21T00:58:23Z Particles measuring less than 2.5 micrometers in diameter, also known as fine particles or soot, are possibly the most deadly widespread air pollutant. EPA to tighten national soot standards 2012-06-14T23:09:00Z Particle pollution measuring less than 2.5 micrometers in diameter, also known as fine particles or soot, is possibly the most deadly widespread air pollutant. EPA to tighten national soot standards 2012-06-14T23:09:00Z The wave sweeps through the brain at approximately 14 micrometers per second; the microglia turn their fingerlike appendages in the direction of the wave and then begin migrating toward the injury site within one minute. The Brain's Bat Signal 2012-05-24T18:40:00Z Dawes successfully employed the double circular aperture also with Amici’s micrometer. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The next step is to provide a micrometer by means of which tools for various pitches may be tested both for angle and for width of flat, and this is accomplished as follows:— In Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Physicists were sometimes jocularly greeted among astronomers as "ribbon men," and no one even dreamed that their researches were one day to advance to equal recognition with results derived from micrometer, meridian circle, and heliometer. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Bar at lower right is 50 micrometers in 10 micrometer increments. Mystery of Alaskan "Goo" Rust Solved at Last 2012-02-29T15:15:03.853Z The researchers squeezed a single crystal of the material, measuring 100 micrometers in diameter and 50 micrometers thick, between two diamond-tipped anvils. Superconductor Breaks High-Temperature Record 2012-02-22T22:15:22.920Z The present article also deals with other forms of double-image micrometer. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z At the two ends of the frame the micrometer screws are afforded journal bearings. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This instrument consists of a glass micrometer divided into squares of a known size, and a strong microscope for observing the drops on the stage. Meteorology or Weather Explained 2012-02-20T03:00:18.847Z The government recently reversed course and began to track the most pernicious measure of urban air pollution — particulates 2.5 micrometers in diameter or less, or PM 2.5. Internet Criticism Pushes China to Act on Pollution 2012-01-27T17:01:41Z China previously disclosed readings only of pollutant particles that are 10 micrometers in diameter or larger. Beijing begins measuring tiny air pollutants 2012-01-23T20:29:05Z To Bouguer in 1748 is due the true conception of measurement by double image without the auxiliary aid of a filar micrometer, viz. by changing the distance between two object-glasses of equal focus. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z If not, the cross-wire of b was moved till it coincided with the dot 0 and the number of divisions of micrometer head noted. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z With a micrometer scale engraved on glass by Coventry, and containing five hundred lines to the inch, Young obtained interference spectra. Heroes of Science: Physicists 2012-01-17T03:00:17Z Another instrument for measuring the deflection, in two directions at once, of a column under pressure, has micrometer screws with more than two hundred and fifty threads per inch. Scientific American, Vol. XLIII.?No. 1. [New Series.], July 3, 1880 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:30.823Z Each pixel in images of the rock-cloaked bones was barely more than 30 micrometers across. The Year in Pictures 2011-12-22T19:11:37Z The reading micrometers e, f also serve to measure, independently, the separation of the segments, by scales attached to the slides; such measurements can be employed as a check on those made by the screws. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z But if they do not coincide, then the amount of error may be found by the micrometer wheel g, Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The government currently uses an indicator known as PM10 that measures particulate as big as 10 micrometers in diameter for its public pollution data. Death-by-Air in Beijing Exposes Pollution’s Untold Heart Risk 2011-12-16T00:04:06Z Embassy’s pollution feed on Twitter has been a source of tension with the Chinese government because it monitors pollutants of 2.5 micrometers in size. China’s Flight-Canceling Smog Lifts as Pollution Levels Drop 2011-12-07T06:28:19Z The mechanical principle involved in the construction of a micrometer is that of a screw free to move in a fixed nut. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z This ring is necessary in order to allow the rods to follow the micrometer heads when the position angle is changed. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z If not, the cross wire of B was moved till it coincided with dot 0, and the number of divisions of the micrometer head noted. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z China's discloses readings only of pollutant particles that are 10 micrometers in diameter or larger. China Official Says Air Pollution Rules Too Lax 2011-11-11T20:45:12.057Z The Chinese government only releases data measuring pollutants that are 10 micrometers large, and its readings are often not as severe. China’s Flight-Canceling Smog Lifts as Pollution Levels Drop 2011-12-07T06:28:19Z As set in the illustration, the metric micrometers show a space of 13.5 mm., or about one millimeter more than half an inch. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z It is essentially the same in principle as Amici’s micrometer, except that the divided lens is an achromatic positive instead of a negative lens. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Authorities in Beijing, and most Chinese cities, measure air pollution by counting only particles between 2.5 and 10 micrometers in diameter. Chinese Web Users Target Air Pollution 2011-11-08T21:17:28Z The second is the measurement of the weathering of marble and other gravestones, which requires a micrometer. Gravestone Project 2011-10-18T12:15:00.477Z The WHO survey on air quality looked at the density of airborne particles less than 10 micrometers, also called PM10 concentrations. Mongolia's Capital Tries to Shed Its Smog 2011-10-17T14:45:10.843Z A little study of the foregoing matter will make it easy to understand the action of either the inch or metric micrometer. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Arago made many measures of the diameters of the planets with such a micrometer. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z They also estimated the resulting increases in the concentrations of airborne particles smaller than 2.5 micrometers across, the size of aerosols that are most easily drawn into human lungs and that cause cardiopulmonary distress. Return of a Killer Volcano 2011-09-19T20:00:00Z The horizontal circle of 14-in. diameter is read by three micrometer microscopes; the vertical circle has a diameter of 12 in., and is read by two microscopes. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z In one instance, the amber holds regularly spaced, hollow filaments, each of which is about 16 micrometers in diameter, about the size of the finest human hair. 'Dinofuzz' Found in Canadian Amber 2011-09-15T16:45:05Z The micrometer may be of the caliper form for measuring outside diameters or it may be of the form shown at Fig. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z This micrometer is provided with two pairs of parallel webs. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z In many cases the orifice is a rectangular slot in a brass plate and is adjusted by means of a brass slide operated by a micrometer screw. Chlorination of Water 2011-09-13T02:00:32.243Z The micrometer microscopes must also measure correct quantities on the divided circle or circles. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The size of the hole can be varied by moving slides, worked by micrometer screws so fine that they measure the dimensions of the hole to the four-hundredth of an inch. McClure's Magazine, Vol. 1, No. 5, October 1893 2011-07-30T02:00:16.467Z Two forms of micrometers for external measurements are shown at Fig. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Double-Image Micrometers with Divided Lenses.—Various micrometers have been invented besides the heliometer for measuring by double image. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z A confocal microscope charts in exquisite detail variations in the depths of the grooves as small as a tenth of a micrometer, or about 1/250 the thickness of a human hair. Scientists Play World's Oldest Commercial Record 2011-07-06T19:20:00Z Two extremely sensitive levels are attached to the telescope, which latter carries a micrometer in its eye-piece, with a screw of long range for measuring differences of zenith distance. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Even smaller is the contact area between the pars stridens and abdomen section, which is about 50 micrometers wide. French Bug Plays 100-Decibel Mating Call on Genitalia 2011-07-01T20:45:00.240Z As will be evident from the development of the scale on the barrel of the inch micrometer, the sleeve is marked with forty lines to the inch, each of these lines indicating twenty-five thousandths. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Plano-convex, convex towards c ” 1 The lens b is divided, and one of the segments is moved by a micrometer screw. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Creating such a topographic map was essential because Edison's recording styluses cut grooves a few micrometers deeper or shallower depending on the timbre of the voice and the words spoken. Scientists Play World's Oldest Commercial Record 2011-07-06T19:20:00Z The micrometer has thus measured the difference of the zenith distances, and the calculation to get the latitude is most simple. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z All the micrometers of which Mr. Buckle speaks depend, either directly or indirectly, upon lines for their graduations, and the positions of these lines are indicated by rulings or scratches. The Seven Follies of Science [2nd ed.] A popular account of the most famous scientific impossibilities and the attempts which have been made to solve them. 2011-06-30T02:00:34.290Z The operation of both forms is identical except that the internal micrometer is placed inside of the bore to be measured while the external form is used just the same as a caliper. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Yet the beautiful images which these micrometers give permit the measurement of very difficult objects as a check on measures with the parallel-wire micrometer. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Only 15 micrometers in diameter, the optode was small enough not to rupture the diving bell when the researchers poked it through the webby membrane and measured how gases move across the bell's surface. Underwater Spider Spins Itself an Aqualung 2011-06-09T05:30:33Z The “observing” part becomes challenging when the organisms you study are less than five micrometers long. Scientist at Work: Microbial Life in the Ocean's Desert 2011-04-27T18:42:49Z Formerly, and until the invention of the micrometer, in the seventeenth century, it was impossible to detect it at all. The Seven Follies of Science [2nd ed.] A popular account of the most famous scientific impossibilities and the attempts which have been made to solve them. 2011-06-30T02:00:34.290Z If the micrometer is rotated one full turn the opening between the spindle and anvil will be .025 inch. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z The small interval between the adjacent limbs was then measured with a wire micrometer. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The bottom of the box is a micrometer plate, divided rectangularly in millimetres. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Small Sliding Microtome, length of bed 21 cm, heavy knife-carrier, object clamp for specimen 25 mm diam., micrometer screw with disc graduated into 100 degrees, each division representing a motion of 0,005 mm. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z It is not possible to do this, even approximately, with soft rubbers, as the rubber gives under the pressure of the micrometer. The Preparation of Plantation Rubber 2011-03-09T03:00:40.870Z With a metric micrometer there are fifty graduations on the barrel, these representing .01 of a millimeter, or approximately .004 inch. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z This extreme sensibility is obtained by the use of micrometer scales and cross threads at the end of the beam, these being observed by means of a telescope. The Galaxy Vol. XXIII?March, 1877.?No. 3 2011-01-31T03:00:16.193Z The ends which came through the mirror were connected with a spark micrometer, the sparks being observed from behind the mirror. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The adjustments of the objectives are accomplished by rack and pinion and by micrometer screw. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z To make this measurement, two micrometer microscopes which project horizontally through the comparator are alternately focused on the knife edges and on the standard scale. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z Both of the micrometers shown have a small knurled knob at the end of the barrel. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z She was grinding pieces of metal, measuring each with a micrometer. Guilt of the Brass Thieves 2011-01-04T03:01:18.213Z This in its simplest form consisted of a ring of wire nearly closed terminating in spark balls very close together, adjustable as to distance by a micrometer screw. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Objective carrier with micrometer screw, wide tube with Iris diaphragm $120.— Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z The cloud particles so formed were allowed to fall on a micrometer and their number counted by the aid of an ordinary short-focussed lens. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z The team estimates that if the material removed by the dust devil were instead spread evenly over the whirlwind’s path, that layer would measure about 2 micrometers thick. Trailing Dust Devils 2010-07-28T15:09:00Z Overall, the study found, the average carotid IMT increased in both women and men over the study period -- by an average of roughly 7 micrometers per year for women, and 9 micrometers for men. More children, higher stroke risk for women? 2010-06-23T19:00:00Z By having two micrometers or gages, one set for the radial dimension x and the other for the chordal distance y, the work may be done in a comparatively short time. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The automatic feed is arranged as follows: With each return of the knife-carrier to the end of its track pressure is made upon an adjustable lever which regulates the motion of the micrometer wheel. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z He is the inventor of the rock crystal prismatic micrometer, the ring micrometer. The Popes and Science The History of the Papal Relations to Science During the Middle Ages and Down to Our Own Time The levers were all fitted with micrometer adjustments. Clever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychology Among them were an elegant solution of the problem to determine the orbit of a comet from three observations, and memoirs on the micrometer and achromatic telescopes. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" If the diameter of the buttons is first determined by measuring with a micrometer, and then this diameter is deducted from the center distance x, the difference will be the distance y between adjacent buttons. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. A micrometer, 1 cm long and divided into 100, in the diaphragm of the ocular still further increases the availability of the instrument for making fine and accurate measurements. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z To some electrometers, in order to avoid errors of parallax, a small telescope, with a micrometer wire, has been added; but, with a little practice, we can read accurately without this refinement. The Eruption of Vesuvius in 1872 The distances of the ends of the thread from the nearest degree divisions are estimated by the aid of micrometers to the thousandth of a degree. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" All measurements of the bacula were made by means of an eyepiece micrometer. The Baculum in the Chipmunks of Western North America The diameter as indicated by this micrometer is the “pitch diameter” of the thread and is equal to the outside diameter minus the depth of one thread. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Coarse adjustment by rack and pinion, fine adjustment by micrometer screw with graduated head. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z When 304 very close readings are required, they are made by means of a traversing geometric micrometer microscope. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" The capillary tube can be raised or lowered at will by running a magnet outside the tube, and the heights of the columns are measured by a cathetometer or micrometer microscope. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" And we don't have a common ruler aboard, much less a micrometer. Hanging by a Thread The dimension M over the wires is then measured with an ordinary micrometer. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The specimen carrier is moved vertically by means of a micrometer screw to which a large disc is attached. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z By means of an instrument furnished with a microscope and micrometers, the length and amplitude, and the angle at which the curved line cut the central line, were measured. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" To identify these varieties other than by their ranges will require micrometer calipers and the services of the men who separated them. 498a. The Bird Book Illustrating in natural colors more than seven hundred North American birds; also several hundred photographs of their nests and eggs. He was bending over the wheel, adjusting a micrometer. Astounding Stories of Super-Science, November, 1930 The die head has a micrometer scale which is used when making slight adjustments to compensate for the wear of the chasers or to make either a tight-or a loose-fitting thread. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Glass slide with cell 2/10 mm deep, with ocular micrometer No. 89, in box $3.25 No. 91. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z After a record has been made it is read by means of a micrometer microscope, the angle moved through by the photographic disk is found, and hence the time period between two events. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" It's a delicate operation to blur the present without shooting out a hundred years or so in time," he said, "but my micrometer's pretty accurate, Dent. Astounding Stories of Super-Science, May, 1930 If the top lense of the eye-piece be unscrewed, a diaphragm will be found on which the eye-piece micrometer will easily rest. The Story of the Cotton Plant When measuring the “angle diameter” of a thread, the micrometer should be passed back and forth across the thread, in order to make sure that the largest dimension or the actual diameter is being measured. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The stand is inclinable and fitted with revolving centering stage, coarse adjustment by rack and pinion, fine adjustment by micrometer screw with scale. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z On the diameter and magnitude of the Georgium Sidus, with a description of the dark and lucid disk and periphery micrometers. Sir William Herschel: His Life and Works I—I turned the micrometer screw a trifle hard. Astounding Stories of Super-Science, May, 1930 Now look at the divisions in the eye-piece micrometer, which are 1⁄100th of an inch apart. The Story of the Cotton Plant This rapid traverse is controlled by the key-handles J. The feed-screws for the vertical head have micrometer dials K for making accurate adjustments. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. They are all provided with fine adjustment by micrometer screw. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z His micrometers for measuring position angles, his lamp micrometer, the method of limiting apertures, and the methods he used for viewing the sun may be mentioned among these. Sir William Herschel: His Life and Works They watched Parrish as his eyes wandered along the rows of figures, while his fingers moved the micrometer screws. Astounding Stories of Super-Science, May, 1930 It will be found often that an exact number of these divisions fill up one of the 1⁄100th divisions of the stage micrometer markings. The Story of the Cotton Plant The adjustment is made by the two screws shown, the amount being indicated by a micrometer scale. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. This device may be so adjusted as to move the micrometer disc any number of teeth from one to ten with each sweep of the knife. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z The micrometer is now regarded as an indispensable appliance in the observatory; the use of a spider web reticule instead of wire having improved its efficiency. The Astronomy of Milton's 'Paradise Lost' Turn all the micrometer screws until the needles register zero, Parrish. Astounding Stories of Super-Science, May, 1930 For every fresh objective used, a fresh estimation of eye-piece and stage micrometer ratio is necessary. The Story of the Cotton Plant The different cutters required for boring are mounted on one bar as shown, and the casting is adjusted crosswise to bring each valve chamber in position, by using the micrometer dial. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The fine adjustment consists of a micrometer screw which moves the tube and arm of the microscope supporting the coarse adjustment vertically upon a triangular column. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z A micrometer consists of a short tube, across the opening of which are stretched two parallel wires; these being intersected at right angles by a third. The Astronomy of Milton's 'Paradise Lost' These observations were made by adjusting a micrometer to a very powerful telescope, and were data sufficient for the determination of the orbit of the revolving star, should it be a binary system. Personal Recollections, from Early Life to Old Age, of Mary Somerville Having now got in the eye-piece micrometer a unit of measurement, it becomes a comparatively easy matter to measure the fibre. The Story of the Cotton Plant There are also micrometer dials graduated to thousandths of an inch and used for adjusting the tools without the use of measuring instruments. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The mount unscrews in the centre to permit the introduction of the micrometer scale. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z Place the filar micrometer and the stage micrometer in their respective positions. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. Vertical circle has a diameter of 13 cm. is divided to 10 min. and reads by means of two micrometer microscopes to 10 sec. Astronomical Instruments and Accessories To show how to exactly measure the lengths and diameters of fibres by means of micrometers. The Story of the Cotton Plant A few of the minor planets appear in powerful telescopes as discs with appreciable dimensions, and they have even been measured with the micrometer. The Story of the Heavens Once adjusted in this way the micrometer values are the same for all the eye lenses of the combination. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z Rotate the head of the micrometer screw until the movable line has transversed one division of the stage micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The measurement depends on the accuracy of the micrometer screw, which is cut and corrected with great care. Astronomical Instruments and Accessories By having a stage micrometer and camera lucida. The Story of the Cotton Plant The method of observing which Brünnow employed was quite different from that of Struve, though the filar micrometer was used in both cases. The Story of the Heavens Medium Size Microscope, stand inclinable to the extent of 45°, tripod foot, coarse adjustment by rack and pinion, fine adjustment by micrometer screw. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z Note the optical combination employed in this experiment and record it carefully, together with the micrometer value in terms of µ. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. Price $175.00 Note.—The micrometer on microscope as shown in cut is not furnished with instrument. Astronomical Instruments and Accessories A stage micrometer consists of a slip of glass 3" × 1" on which are marked divisions of an inch, usually 1⁄100ths and 1⁄1000ths. The Story of the Cotton Plant The difficulty in the process arises from the fact that these ellipses are so small that our micrometers often fail to detect them. The Story of the Heavens All went well, there were no incidents, no vessels disturbed him; though had the two components of the binary been at periastron, it would have simplified the work with the position micrometer. Next Door, Next World Adjust the micrometer on the stage of the microscope and accurately focus the divisions. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The circle is arranged similar to a position micrometer. Astronomical Instruments and Accessories Eye-piece micrometers vary much in form, size and value, but the one which is here described is of the simplest type. The Story of the Cotton Plant The objects to which the astronomer applies the micrometer are usually anything but small. The Story of the Heavens A most ingenious substitution of a spider's long threads for wires in micrometer scales, intended for delicate astronomical observations. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. The value of one division of the micrometer scale must first be ascertained for each optical combination by the aid of the stage micrometer, thus: 1. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The micrometer is fitted with sliding eye piece and counter for full revolutions. Astronomical Instruments and Accessories If the micrometer is not properly in focus after a few trials, it may easily be made right. The Story of the Cotton Plant In the filar micrometer two spider lines are parallel, and one intersects them at right angles. The Story of the Heavens Stuyvesant crossed the floor and measured the 77 blocks with a micrometer gage, after which he filled two of the graduated glass measures and then weighed the water. Brandon of the Engineers It is a small piece of apparatus resembling an eyepiece, with a sliding eye lens, which can be accurately focussed on a micrometer scale fixed within the instrument. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The top carriage can be moved by hand and accurately set by means of a micrometer screw. Astronomical Instruments and Accessories If an exact number are not found, the draw-tube at the top end of the body-tube should be withdrawn until an exact number is found to lie within two lines of the lower micrometer. The Story of the Cotton Plant Venus by this time was well on the sun, and we therefore prepared to make observations with the micrometer attached to the eye-piece. The Story of the Heavens It is essential that both thread and stage micrometer should occupy the same position in the field, for errors due to unequal distortion may otherwise become of importance. On Laboratory Arts Place a stage micrometer divided into hundredths of a millimetre on the microscope stage and focus accurately. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The smaller measurements, to 1-4000 of a mm., are made by the micrometer. Astronomical Instruments and Accessories To this may be added an endless variety of small bench tools, micrometers, protractors, arbors, collets, box tools and scrapers. Practical Mechanics for Boys Indeed, as if no circumstance in the confirmation should be wanting, the diameter of the planet, as measured by the micrometers at Berlin, proved to be practically coincident with that anticipated by Le Verrier. The Story of the Heavens In this case the value of the subsidiary scale divisions must be obtained from the divisions of the stage micrometer, coinciding as nearly as possible with the position occupied by the thread. On Laboratory Arts Micrometer.—Some form of micrometer for the purpose of measuring bacteria and other objects is also essential. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. True to prediction, the pilot ray of P6 came in almost upon the exact center of the micrometer screen, and Breckenridge smiled in relief as he began really to enjoy the trip. Spacehounds of IPC During this period he had invented an improved micrometer, and also continued his experiments with steam as a motive power. Hidden Treasures Or, Why Some Succeed While Others Fail To give some idea of Schmidt's amazing industry in lunar researches, it may be mentioned that in six years he made nearly 57,000 individual settings of his micrometer in the measurement of lunar altitudes. The Story of the Heavens In this method an ordinary microscope is employed together with a scale micrometer, and either an eyepiece micrometer, or a camera and subsidiary scale. On Laboratory Arts Special eyepieces are also obtainable having a sledging adjustment to the eye lens for focussing the micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. He closed the connections which transferred the central portion of the upper lookout screen to a small micrometer screen at Breckenridge's desk and plugged it into the first check-station. Spacehounds of IPC He might have been turning the screw of a micrometer; I could not see. Caves of Terror The necessary measurements are made by that indispensable adjunct to the equatorial telescope known as the micrometer. The Story of the Heavens The detail of making a measurement by means of the micrometer eyepiece is very simple. On Laboratory Arts Insert the eyepiece micrometer inside the ocular and adjust the stage micrometer on the stage of the microscope. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. At the end of three days of the mad flight, the pursuing space ship was in plain sight, covering hundreds of divisions of the micrometer screens. Spacehounds of IPC Arrangement for testing electric piles.—Very rapid electric tuning fork.—A vibrating micrometer 5824 IV. Scientific American Supplement, No. 365, December 30, 1882 The velocity with which a prominence shoots upward from the sun's limb can, of course, be measured directly by observations of the ordinary kind with a micrometer. The Story of the Heavens It is evident, therefore, the micrometer must always be used in the same way. A Text-book of Assaying: For the Use of Those Connected with Mines. Focus the scale of the stage micrometer accurately; the lines will appear to be immediately below those of the eyepiece micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The latter contains Nobel and Schoene elutriators, together with viscosimeters of the flow and the Coulomb and Clark electrical types, sieves, voluminometers, colorimeters, vernier shrinkage gauges, micrometers, microscopes, and the necessary balances. Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 The measurement is effected by the aid of a very simple apparatus that I have before described under the name of the vibrating micrometer. Scientific American Supplement, No. 365, December 30, 1882 This mounting is called the "micrometer" device, because of the accuracy of adjustment. The Traveling Engineers' Association To Improve The Locomotive Engine Service of American Railroads Most assayers, however, using a micrometer in this way, would like to know its absolute value. A Text-book of Assaying: For the Use of Those Connected with Mines. Make the lines on the two micrometers parallel by rotating the ocular. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The micrometer screw F is tapped through B'' as in the ordinary Howard regulator, and the screw should be about No. 6 of a Swiss screw-plate. Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology We now fixed the micrometers to the telescopes, and observed or measured the uneclipsed part of the sun's disk. A General History and Collection of Voyages and Travels, Volume 16 The length of this shadow is easily found by means of a telescope, whose object glass is provided with a micrometer. All Around the Moon It is safer, however, to compare with a micrometer the diameter of the button whose weight has to be determined with that of a standard button of nearly equal size whose weight is known. A Text-book of Assaying: For the Use of Those Connected with Mines. Where x = the number of included divisions of the eyepiece micrometer. y = the number of included divisions of the stage micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. A quicker way is to gage the hole jewel and then turn the pivot to the right size, as measured by micrometer calipers. Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology After the records were taken, a microscope with either 2 or 4 Leitz objective and a micrometer ocular was substituted for the recorder. Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. The eye-piece is fitted with two micrometers, for vertical and horizontal observations. The Uses of Astronomy An Oration Delivered at Albany on the 28th of July, 1856 To do this, a stage micrometer must be purchased. A Text-book of Assaying: For the Use of Those Connected with Mines. Note the optical combination employed in this experiment and record it with the calculated micrometer value. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. These are turned to diameters, and are the most readily secured by the use of the micrometer calipers to be had of any large watchmakers' tool and supply house. Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology The microscope was focussed, and adjusted by the screw of the shoe until it had the record line in its field; the micrometer furnished an object of reference in the field. Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. That is a measurement which we may easily make directly with a micrometer. Scientific American Supplement, No. 470, January 3, 1885 Scales specially constructed for measuring silver and gold buttons may be purchased; but it is much better to make the measurement with the help of a microscope provided with an eyepiece micrometer. A Text-book of Assaying: For the Use of Those Connected with Mines. Rotate the eikonometer until the lines on the two scales are parallel, and make the various adjustments to ensure that two lines on the eikonometer scale coincide with two lines on the stage micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. With the advantages of accurate micrometer calipers now possessed by the horological student it is an easy matter to get at the angular extent of the real lift of any cylinder. Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology The micrometer measurements in this case could be made at least as rapidly as measurements of kymograph curves. Harvard Psychological Studies, Volume 1 Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. He applied the micrometer and drew back that I might see for myself. The Gloved Hand The sun afterwards rose in a cloudless sky and I ascertained the breadth of the river by means of a micrometer telescope to be exactly 70 yards. Three Expeditions into the Interior of Eastern Australia, Volume 2 Rotate the screw of the filar micrometer until the movable wire coincides with the fixed one, and the index marks zero on the drum head. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. A third method consists in measuring the profile of the lunar mountains outlined on the background by means of a micrometer; but it is only applicable to the heights near the border of the orb. The Moon-Voyage A simple, fairly accurate, and easily made apparatus of the micrometer form may be constructed as shown by the accompanying sketch. The Boy Mechanic: Volume 1 700 Things for Boys to Do Any mechanic knows that it is a sad waste of time and pains to standardize tenons, with micrometer and emery paper, to a thousandth of an inch, so long as the mortises are left unstandardized. Analyzing Character The "radius of measurement" is the distance between the front face of the revolving mirror and the cross-hair of the micrometer. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Focus the scale of each micrometer accurately, and make the lines on them parallel. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. I have a number of these micrometers of different scales, and I find them invaluable in examining cheques, doubtful signatures and such like. The Red Thumb Mark Quite accurate measurements may be made with this instrument, says the Scientific American, and in the absence of the expensive micrometer, it serves a very useful purpose. The Boy Mechanic: Volume 1 700 Things for Boys to Do Occasionally he broke out his micrometer, measured a blade or two. The Tarn of Eternity This was done by setting the eye-piece approximately to the expected deflection, and turning the whole micrometer about a vertical axis till the cross-hair bisected the circular field of light reflected from the revolving mirror. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Wright's Eikonometer is really a modification of the eyepiece micrometer for rapidly measuring microscopical objects by direct inspection, having previously determined the magnifying power of the particular optical combination employed. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. You see, Jervis, we have photographed the thumb-print in contact with a numbered micrometer divided into square twelfths of an inch. The Red Thumb Mark This is ascertained by means of a micrometer screw, S, which moves a needle, T, in front of the dial. Edison, His Life and Inventions The 1875 piece was a hair thinner than the other coins, but neither Clayton nor Spider could have detected it without the aid of a micrometer. Return of Tarzan The comparison of the micrometer with two scales made by Mr. Rogers, of the Harvard Observatory, has been completed. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Observation through the eikonometer shows its micrometer scale superposed on the image of the stage micrometer. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. He reversed the dark slide and made another exposure in the same way, and then, having removed the micrometer and replaced it by a slip of plain glass, he made two more exposures. The Red Thumb Mark Wonderful as was this achievement of the micrometer, one not less surprising awaited its delicate measurement. Scientific American Supplement, No. 288, July 9, 1881 This serves the purpose of a double image micrometer, and is made by dividing the object-glass of a telescope along a diameter. History of Astronomy The first observation with the new micrometer eye-piece was made April 2, the deflection being 115 millimeters. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Project the scale of the stage micrometer on to a piece of paper and with pen or pencil sketch in the magnified image, each division of which corresponds to 10µ. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. In the second place, on measuring the print with a micrometer, I found that it did not agree in dimensions with a genuine thumb-print of Reuben Hornby. The Red Thumb Mark Another result followed the use of the micrometer: the detection of the proper motion of the stars. Scientific American Supplement, No. 288, July 9, 1881 Huyghens used a metal strip of variable width in the focus, as a micrometer to cover a planetary disc, and so to measure the width covered by the planet. History of Astronomy D = twice the distance between the mirrors. n = number of revolutions per second. α = inclination of plane of rotation d = deflection as read from micrometer. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Calculate the value of each division of the eyepiece micrometer in terms of µ, by means of the following formula: x = 10 y. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. I have here enlargements of the two photographs in which the disagreement in size is clearly shown by the lines of the micrometer. The Red Thumb Mark Astronomers observe a star to-day with a powerful telescope and micrometer; and in six months again measure the same star. Scientific American Supplement, No. 288, July 9, 1881 Our system of inspection with special micrometer gauges insures all parts being perfect—within one-thousandth of an inch of absolute accuracy. Business Correspondence They represent the value of one turn of the micrometer in millimeters. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis The boys who have progressed furthest do fine micrometer work, and they do every operation with a clear understanding of the purposes and principles involved. My Life and Work "We had better also take a microscope and the micrometers, though we are not likely to want them; that is all, I think." The Red Thumb Mark Finally micrometers were made that measured lines requiring 100,000 to make an inch; and a new series of observations begun, crowning the labors of a century with success. Scientific American Supplement, No. 288, July 9, 1881 Adopting the same principle on a larger scale, I have had constructed by Mr Hilger a micrometer with double refraction of a sphere of Iceland spar. Autobiography of Sir George Biddell Airy The micrometer eye-piece used was substantially the same as Foucault's, except that part of the inclined plate of glass was silvered, thus securing a much greater quantity of light. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis She threads a needle almost as soon as she speaks; she touches threads as delicate as the spider-web of a micrometer. Maria Mitchell: Life, Letters, and Journals At 4h. on the second day of the descent, I was about 500,000 miles from Mars, the micrometer verifying, by the increased angle subtended by the diameter, my calculated rate of approach. Across the Zodiac This is not all the micrometer enables man to know, When the distance separating the earth from two celestial bodies that revolve is learned, the distance between the two orbs becomes known. Scientific American Supplement, No. 288, July 9, 1881 The counting by the micrometer took him a week. Masterpieces of American Wit and Humor Thus the micrometer eye-piece is much simplified, and many possible sources of error are removed. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis The eye that directs a needle in the delicate meshes of embroidery will equally well bisect a star with the spider web of the micrometer. Maria Mitchell: Life, Letters, and Journals Short bits of the paper, thread, and hair were then cut off and measured by a micrometer, so that their weights could be easily calculated. Insectivorous Plants For several thousand years the stars have been called "fixed," but the fine rulings of the filar micrometer tell a different story. Scientific American Supplement, No. 288, July 9, 1881 Smith turned one of them in and out, and said it reminded him of a micrometer gage. The Lord of Death and the Queen of Life Under these circumstances it was interesting to observe how rapidly the circumnutating apex of a cotyledon passed across the divisions of the micrometer. The Power of Movement in Plants "But by measurements made by this vernier micrometer caliper I can find the precise thickness of the paper as compared to the other samples." Gold of the Gods If it comes to a show-down I suppose I shall have to prove my point with the micrometer measurements down to the fifty- thousandth part of an inch. The Poisoned Pen Thus the micrometer revealed to man the magnitude and general structure, together with the motions and revolutions of the sidereal heavens. Scientific American Supplement, No. 288, July 9, 1881 The numbers refer to divisions of the micrometer equalling 1/300 millimetres. The Different Forms of Flowers on Plants of the Same Species After an interval of 30 m. the apex was observed, and it was seen to cross a little obliquely two divisions of the micrometer in 9 m. The Power of Movement in Plants It must further be remembered that Tycho had no clocks, and no micrometers. Great Astronomers If it comes to a show-down I suppose I shall have to prove my point with the micrometer measurements down to the fifty-thousandth part of an inch. The Poisoned Pen With the telescope, micrometer, heliostat, and spectroscope came desire for more complex instruments, resulting in the invention of the photoheliograph, invoking the aid of photography to make permanent the results of these exciting researches. Scientific American Supplement, No. 288, July 9, 1881 I measured with the micrometer many specimens, both dry and wet, taken from plants growing in different situations, and always found a palpable difference. The Different Forms of Flowers on Plants of the Same Species The tip of the cotyledon passed across 10 divisions of the micrometer, that is, 1/50 of an inch, in 6 m. The Power of Movement in Plants The best subjects for the experiment are Mr. Coventry's exquisite micrometers; such of them as consist of parallel lines drawn on glass, at a distance of one-five-hundredth of an inch, are the most convenient. A History of Science — Volume 3 The micrometer as used in telescopes enables the observer to measure accurately small angular distances. A History of Science — Volume 2 This huge photograph can be viewed in detail with a small telescope and micrometer, and the crests of solar waves measured. Scientific American Supplement, No. 288, July 9, 1881 Their stigmas are much less papillose, and smaller in about the ratio of 13 to 20 divisions of the micrometer, as measured transversely from apex to apex, than the stigmas of the perfect flowers. The Different Forms of Flowers on Plants of the Same Species The most remarkable fact was the oscillatory movement above described, and the difference of rate at which the point crossed the divisions of the micrometer, after short intervals of time. The Power of Movement in Plants But these revelations of the micrometer are tame compared with its final achievement, the discovery of parallax. Scientific American Supplement, No. 288, July 9, 1881 The principle of Gascoigne's micrometer was that of two pointers lying parallel, and in this position pointing to zero. A History of Science — Volume 2 After this, if any movement of the stars takes place, the tell tale micrometer at once detects it. Scientific American Supplement, No. 288, July 9, 1881 Seedling cabbages circumnutate much more quickly, for the tip of a cotyledon crossed 1/100th of an inch on the micrometer in 3 m. The Power of Movement in Plants The distance between the extreme right and left positions of the radicle A, in its lateral movement, was 2 mm., as ascertained by measurement with an eye-piece micrometer. The Power of Movement in Plants The plant was placed under a microscope with the stage removed and with an eye-piece micrometer, of which each division equalled 1/500 of an inch. The Power of Movement in Plants Malvasia's micrometer, which he described in 1662, consisted of fine silver wires placed at right-angles at the focus of his telescope. A History of Science — Volume 2 At the eye end of the telescope is attached the spectroscope and the micrometer, and the whole set of instruments so adjusted that just the edge of the sun is seen, making a half spectrum. Scientific American Supplement, No. 288, July 9, 1881 It crossed five divisions of the micrometer, that is, 1/100th of an inch, in 6 m. The Power of Movement in Plants The plant, with a little triangle of paper attached to one of the marginal spikes, was placed under a microscope with an eye-piece micrometer, each division of which equalled 1/500 of an inch. The Power of Movement in Plants Huygens was one of the first to adapt the micrometer to the telescope—a mechanical device on which all the nice determination of minute distances depends. A History of Science — Volume 2 Huygens's micrometer was a slip of metal of variable breadth inserted at the focus of the telescope. A History of Science — Volume 2 |
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