| 单词 | revolutions per minute |
| 例句 | “Reducing the number of revolutions per minute,” Mr. Foster explained. Brave New World 1932-01-01T00:00:00Z But the rotor blades spinning at 500 revolutions per minute add a bit of danger. Somewhere Between a Shared Cab and a Private Jet, It’s the Commuter Helicopter 2020-02-01T05:00:00Z To accomplish all this, the helicopter’s twin, counterrotating rotor blades needed to spin at 2,500 revolutions per minute — five times faster than on Earth. Mini helicopter makes historic flight on Mars 2021-04-19T04:00:00Z Slowly rotating the feathers for occasional touches produced better results than a tactile overload at 30 revolutions per minute, the team found. A loving touch triggers cockroaches to make babies faster 2014-04-05T12:00:00Z At the pier, the girls make one last plea to squeeze in a final spin on Inkie's Scrambler, a swirling ride that rotates at a speed of more than 11 revolutions per minute. The star of 'Matilda'? It's a constellation made of three vivacious young actresses 2015-06-26T04:00:00Z He tumbled toward Earth at 120 revolutions per minute, but his main parachute opened at 10,000 feet, as designed, slowing him down and saving his life. Joseph Kittinger, a Record-Setter High in the Skies, Dies at 94 2022-12-09T05:00:00Z To add stability to LOFTID, the rocket stage began spinning like a top at a languid three revolutions per minute before releasing the test craft for its journey through the atmosphere. NASA Launched an Inflatable Flying Saucer Then Landed It in the Ocean 2022-11-10T05:00:00Z Two large propellers began turning — slowly at first, but gaining speed until they leveled off at more than 2,000 revolutions per minute. The harrowing, forgotten journey of the first transatlantic flight 2022-05-21T04:00:00Z A helicopter blade spins at exactly 100 revolutions per minute. College Physics for AP Courses 2015-08-12T00:00:00Z How many revolutions per minute do the wheels make? Precalculus 2021-12-01T00:00:00Z Hunter said Raeth’s slider — which has registered a spin rate of more than 2,400 revolutions per minute — is already on par with the average MLB slider. Mariners select UW’s Stefan Raeth on final day of MLB draft 2022-07-19T04:00:00Z The average velocity of his fastball has dropped from close to 97 mph two years ago to 95 mph and spin rate from nearly 2,500 revolutions per minute last year to under 2,300. Hernández: Where is Walker Buehler? The pitcher is still searching for his old self 2022-05-18T04:00:00Z If you’re one of the lucky few driving a stick shift these days, bear in mind that higher revolutions per minute can be less fuel efficient. How to spend less on gas: Fix your car. Drive slower. Ignore Shaq 2022-03-10T05:00:00Z To take off and stay aloft in the thin Martian atmosphere, this “Marscopter” would have to spin its blades at about 2,800 revolutions per minute—about 10 times faster than helicopters on Earth. The Best Fun Science Stories of 2021: Rhythmic Lemurs, a Marscopter, and Sex-Obsessed Insect Zombies 2021-12-27T05:00:00Z How many revolutions per minute do the wheels make? Precalculus 2021-12-01T00:00:00Z A button on the mask can turn on the fans and toggle between two speeds: 4200 and 6200 revolutions per minute. Razer’s futuristic Zephyr mask is available today, starting at $99.99 2021-10-21T04:00:00Z As he drove around, a computer screen showed power distribution for the battery and the fuel cell and the revolutions per minute for the motor. Can a Carbon-Emitting Iron Ore Tycoon Save the Planet? 2021-10-16T04:00:00Z The engine needed a belt-driven cooling fan, but belts failed at top revolutions per minute, owing to the weight of the fan. How G.M.’s First Turbo Engines Crashed and Burned 2021-08-26T04:00:00Z A recent analysis by The Washington Post showed that spin rates — the number of revolutions per minute a baseball makes on its way to home plate — have decreased across the majors. Analysis | MLB pitchers already have tied the record for no-hitters in a season. Here’s what’s fueling the surge. 2021-07-15T04:00:00Z But in mid-May, the revolutions per minute dropped off the table for many pitchers. Foreign substance enforcement brings lower spin rates, improving offense 2021-07-06T04:00:00Z He even showed it in the first inning of a start in April 2018, with Cleveland, when he raised his spin rate by about 300 revolutions per minute. Once Again, M.L.B. Faces a Crisis of Its Own Making 2021-06-15T04:00:00Z The low hum from the helicopter blades spinning at more than 2,500 revolutions per minute is barely audible. NASA Mars helicopter heard humming through thin Martian air 2021-05-07T04:00:00Z To accomplish all that, the helicopter’s twin, counter-rotating rotor blades needed to spin at 2,500 revolutions per minute — five times faster than on Earth. NASA’s Mars helicopter takes flight, 1st for another planet 2021-04-19T04:00:00Z To accomplish all that, the helicopter’s twin, counter-rotating rotor blades needed to spin at 2,500 revolutions per minute - five times faster than on Earth. NASA’s Mars helicopter takes flight, 1st for another planet 2021-04-19T04:00:00Z Ingenuity was therefore made extremely light and given the power to turn those blades extremely fast - at over 2,500 revolutions per minute. Nasa successfully flies small helicopter on Mars 2021-04-19T04:00:00Z During Ingenuity’s first test flight, its rotors will be spun at more than 2,500 revolutions per minute, and the helicopter will ascend through the thin atmosphere to just 10 feet. NASA receives first weather reports from Perseverance rover on Mars at Jezero Crater 2021-04-08T04:00:00Z Then, Ingenuity will proceed to run its rotors to 2,537 revolutions per minute, and lift off. The Ingenuity helicopter just survived its first night alone on Mars. Now comes the hard part 2021-04-05T04:00:00Z The plan is for Ingenuity to run its rotors to 2,537 revolutions per minute, and then lift off. First flight on Mars? Ingenuity helicopter preps for takeoff 2021-03-26T04:00:00Z In a demonstration often used by physics professors, a gyroscope made of a bicycle wheel on an axle spins at hundreds of revolutions per minute while the axle is held horizontally. Why a Perfect Spiral Football Pass Doesn’t Break the Laws of Physics 2020-10-16T04:00:00Z Those blades are designed to spin up to 2,400 revolutions per minute — or 40 times a second. A stowaway helicopter on NASA’s Mars rover will attempt the first flight on another world 2020-07-29T04:00:00Z This clear tank agitates a gallon of water at a gentle 18 revolutions per minute for 30 minutes. Clogging the system: The feud over flushable wipes 2019-12-26T05:00:00Z Then the fridges fall into another chamber where huge metal chains, like the kind you see holding ships at the docks, whip the white goods at 500 revolutions per minute. When fridges die, where do they go? 2019-11-28T05:00:00Z In the team’s lab tests, an untwisting fiber spun a bit of paper at 600 revolutions per minute for a full five seconds. A New Twist on Artificial Muscles 2019-07-11T04:00:00Z Dr. Song recorded some of the drops spinning at about 7,300 revolutions per minute when they bounced back from the special surface. This Water Drop, It’s the Greatest Dancer 2019-03-26T04:00:00Z Each gyro consists of a wheel, which spins at a constant rate of 19,200 revolutions per minute, encased inside a sealed cylinder. Hubble Space Telescope Almost Back in Action 2018-10-23T04:00:00Z The machines, which were introduced this term, feature a display that shows duration of pedalling, number of revolutions per minute and calorie consumption - with some pupils burning up to 800 calories a day. Pupils use pedal power under their desks 2018-10-04T04:00:00Z Its saw blade spins at 400 revolutions per minute, compared with a modern electric circular saw that turns at about 4,000 to 5,000 rpm. Revival of water powered sawmill in Vermont nears reality 2018-07-02T04:00:00Z Norsepower’s design is also linked to software that adjusts a rotor’s rate of rotation—up to several hundred revolutions per minute—to maximize forward thrust. Spinning metal sails could slash fuel consumption, emissions on cargo ships 2017-09-06T04:00:00Z They also borrowed equations from the physics of supercoiling DNA strands, and eventually created a prototype that spun at up to 125,000 revolutions per minute. Ted 2017: Frugal scientist offers malaria tools - BBC News 2017-04-25T04:00:00Z Even on the back fields in spring training, the Angels monitored Richards’ velocity down to a decimal and, in revolutions per minute, his spin rate on every pitch. Angels look to maximize extra rest early for ace Garrett Richards 2017-04-02T04:00:00Z For these, he was instructed to increase his pedaling frequency to between 70 and 90 revolutions per minute, compared to about 60 r.p.m. during the easy rides. Lessons on Aging Well, From a 105-Year-Old Cyclist 2017-02-08T05:00:00Z Clocking the process with a high-speed camera showed just how quickly: up to 125,000 revolutions per minute—faster than many commercial centrifuges. This 20-cent paper pinwheel could transform medicine in the developing world 2017-01-10T05:00:00Z The original was also intended to be played at 16 2/3 revolutions per minute, half of the usual speed of LP records. Music for Aliens: Campaign Aims to Reissue Carl Sagan’s Golden Record 2016-09-21T04:00:00Z Oh yeah, remember, if the Plumbus revolves faster than 200 revolutions per minute, it must be boiled. Blu-ray review: ‘Rick and Morty: Season 2’ 2016-08-23T04:00:00Z Having a spin rate below 3,000 revolutions per minute can help, too. Power Prescription: 15 Ways To Get 15 Yards Right Now - Golf Digest 2016-07-18T04:00:00Z The craft, which is shaped like a wind turbine, spun up from its usual 2 revolutions per minute to 5, to keep it stable during the 35-minute blast. Juno becomes first spacecraft to visit Jupiter in 21 years 2016-07-04T04:00:00Z The spacecraft starts slowing its spin rate back down to two revolutions per minute. What to Expect When NASA’s Spacecraft Juno Gets to Jupiter 2016-07-04T04:00:00Z This tube is spun at very high speeds, up to 9,000 revolutions per minute. Machine that 'unboils' eggs may help fight cancer - BBC News 2016-03-21T04:00:00Z Other candidates can be ruled out because when observed in orbit, they haven’t matched WT1190F’s furious spin rate of 40 revolutions per minute. Falling space debris traced to 1998 lunar mission 2016-01-12T05:00:00Z He noted that fan speed would be limited to 10 revolutions per minute, “or else the outer area of the blades would go supersonic.” So What’s the Patriots’ Secret to Success? 2015-10-27T04:00:00Z Then the spacecraft slowed back to 2 revolutions per minute, turned its face back towards the Sun, and began charging its solar-powered batteries again. Juno becomes first spacecraft to visit Jupiter in 21 years 2016-07-04T04:00:00Z The blades, the only moving parts of these machines, spin at 96,000 revolutions per minute. Wal-Mart test truck aims to slash fuel consumption on big rigs 2015-09-19T04:00:00Z They found that internal work jumped 10-fold when a cyclist increased his pedaling rate from 50 to 110 revolutions per minute, regardless of the external work done. A better way to burn calories on your bike 2015-09-14T04:00:00Z The spacecraft also automatically turns back toward Earth and goes into a controlled spin of five revolutions per minute. The inside story of New Horizons’ ‘Apollo 13’ moment on its way to Pluto 2015-07-10T04:00:00Z We get it; circuits and metal are effortlessly turned to a toxic powder when you put them in contact with a blade rotating at several thousand revolutions per minute. It's 2015. Why are we still talking about Will It Blend? 2015-04-27T04:00:00Z All the trademark turbocharged engine sounds are there, but the high-pitched whine blends nicely with the V-8 at higher revolutions per minute. Ferrari passes its turbocharging test with the 2015 California T 2015-01-31T05:00:00Z The full brunt of torque comes on at a very low 1,850 revolutions per minute, so you need a deft touch on the gas pedal. Review: BMW M3 sedan is more functional and fun than its two-door M4 twin 2015-01-10T05:00:00Z A stabiliser parachute deployed too soon, and he began to spin at 120 revolutions per minute, which caused him to lose consciousness. The First Man To Float On The Edge Of Space 2014-10-26T04:00:00Z Though this engine gets a little noisy at high revolutions per minute, it is a study in robust refinement. Mini makes Cooper and Cooper S a better car for a larger audience 2014-09-05T04:00:00Z The V6 spins at more than 110,000 revolutions per minute, making it one of the fastest commercial motors ever made. With DC59 Motorhead, Dyson Looks to Create the iPad of Vacuums 2014-07-16T04:00:00Z They increased the roll rate from 19.16 revolutions per minute to 19.76 RPM, putting it within mission specifications for trajectory corrections. 36-Year-Old NASA Probe's Engines Successfully Fired Up by Private Team 2014-07-06T04:00:00Z He said compensations are made with programming and changing rotors’ revolutions per minute. Advanced radar for drones arrives in Kenai 2014-05-17T04:00:00Z The remainder of the record is in audio, designed to be played at 16-2/3 revolutions per minute. Voyager In Space: Carl Sagan Project From 1977 2013-09-30T14:42:00Z There are no screens to track your revolutions per minute or time; there’s a knob to change resistance and that’s it. Leaning bikes put a new twist on spin 2013-08-29T18:54:36Z His forehand topspin averages 3,200 revolutions per minute and has been clocked as high as 4,900. The U.S. Open Issue: Roger Federer Can Still Get His Game Face On 2013-08-24T20:20:21Z Based on the tests we subject our astronauts to, a rate below two revolutions per minute is livable. How Elysium is a Carnival Ride, and Why its Atmosphere is a Bucket of Water 2013-08-15T18:45:00.960Z Spinning at 1,000–4,000 revolutions per minute, reaction wheels fine-tune a spacecraft’s orientation, exerting precise torques through careful control of their speed. The Wheels Come Off Kepler Planet-Finding Mission 2013-05-22T12:15:02.803Z This device contains two greased rods that spin at 2,400 revolutions per minute for one minute every 10 minutes. Spring tree pollen comes late to Washington, but it packs a punch 2013-04-23T14:21:00Z The unit could discharge at any rate up to three kilowatts until the flywheel spins down to its "fully discharged" speed of 9,000 revolutions per minute. Turn Up the Juice: New Flywheel Raises Hopes for Energy Storage Breakthrough 2013-04-10T11:45:02.273Z That was about four times the number of revolutions per minute that motors its size typically produced, Sir James said. Dyson launches hand drying tap 2013-02-04T23:01:22Z Any faster than that and you start to notice—nausea, dizziness, and trouble walking occur at seven revolutions per minute and above. How Elysium is a Carnival Ride, and Why its Atmosphere is a Bucket of Water 2013-08-15T18:45:00.960Z Test data showed the rocket produced 14,200 pounds of thrust with the Cosworth engine running at over 16,000 revolutions per minute. Boost for land speed record bid after successful rocket test 2012-10-03T15:46:45Z They include legs as thick as telephone poles and a forehand that produces, on average, 3,300 revolutions per minute of dizzying spin. French Open: French Open: Nadal Builds Clay-Court Edge With Spin and Mobility 2012-06-08T01:53:18Z For example, a given motor having, say, eight poles should run, with the armature coil short-circuited, at two thousand revolutions per minute to bring it up to synchronism. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It uses an electromagnetic field, rather than carbon brushes, to accelerate from standstill to up to 100,000 revolutions per minute within 0.7 seconds. Dyson launches hand drying tap 2013-02-04T23:01:22Z Suppose the 120 wheel to make 666⁄100 revolutions per minute, how many will the 40 wheel make? Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z If none are given, churn at 40 to 45 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 9 "Dagupan" to "David" 2012-02-11T03:03:39.807Z The average professional men’s tennis player hits a forehand that spins at 2,700 revolutions per minute. French Open: French Open: Nadal Builds Clay-Court Edge With Spin and Mobility 2012-06-08T01:53:18Z In various experiments this machine has been run as high as 3,000 revolutions per minute. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Although the wheel is described as making 50 revolutions per minute, it may reach 100, more or less. The Little Gleaner, Vol. X. A Monthly Magazine for the Young 2012-02-03T03:00:20.453Z This machine has been run up to 6,000 revolutions per minute, without perceptible jar, and cutter heads as large as 8′′ diameter may be used on it for heavy work. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The cylinder weighed 113·13 pounds, and, with the gun, was turned at the rate of thirty-two revolutions per minute by horse-power. Heroes of Science: Physicists 2012-01-17T03:00:17Z The engine runs about 110 revolutions per minute. Scientific American, Vol. XXXIX.?No. 24. [New Series.], December 14, 1878 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:31.783Z Will an upright boiler, with 135 square feet heating surface, and 4 square feet grate surface, be sufficient to run the engine at 250 or 300 revolutions per minute with 100 lbs. steam? Scientific American, Vol. XXXVII.?No. 2. [New Series.], July 14, 1877 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:29.743Z Those machines turn over at somewhere around twenty-two thousand revolutions per minute, you know.” The Radio Boys at Mountain Pass The Midnight Call for Assistance 2012-01-02T03:00:17.697Z The quotient is the proper number of revolutions per minute. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z B.—Speed of engine, 1,500 revolutions per minute; amount of compression, 61 pounds per square inch, or 11.5 per cent. less. Gas-Engines and Producer-Gas Plants A Practice Treatise Setting Forth the Principles of Gas-Engines and Producer Design, the Selection and Installation of an Engine, Conditions of Perfect Operation, Producer-Gas Engines and Their Possibilities, the Care of Gas-Engines and Producer-Gas Plants, with a Chapter on Volatile Hydrocarbon and Oil Engines 2011-12-28T03:00:31.087Z NOTE—Ten per cent. has been deducted in the above table for stops, etc. 1,450 revolutions per minute of beater. Illustrated Catalogue of Cotton Machinery 2011-12-16T03:00:11.130Z The tachometer operates on the same principle as the speed indicating device or speedometer used in automobiles except that the dial is calibrated to show revolutions per minute instead of miles per hour. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Imagine turning up the record's revolutions per minute to 45, which was the r.p.m. for a single. Google X's Space Elevator: Why It Will Never Happen 2011-11-21T10:00:00Z At what number of revolutions per minute should this governor be driven? Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The motors are designed to run at 3000 revolutions per minute, and they drive the cylinders of the machines through gearing so arranged that the latter turn at 50 revolutions per minute. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z NOTE—Ten per cent. has been deducted in the above table for stops, etc. 1,450 revolutions per minute of beater. Illustrated Catalogue of Cotton Machinery 2011-12-16T03:00:11.130Z If the stroke was only four inches, a normal speed of 1,500 revolutions per minute would be possible without exceeding the prescribed limit. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Inside each one, a nearly weightless suspension arm hovers above a magnetic disk spinning as fast as 7,200 revolutions per minute. After the Floods, a Sea of Disk Drive Shortages 2011-11-17T22:00:24Z The machine is constructed entirely of iron, and the drum is intended to revolve at about 800 revolutions per minute. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A simple form of motor fitted up as just described, and rotating at 3000 revolutions per minute, would give out 100 alternations per second. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Each time the car would stop accelerating in fifth gear, the revolutions per minute stuck at 5,000. Speed Freaks Race Utah Salt Flats With Rocket Truck, Barstools 2011-11-04T04:05:29Z This has been verified in experiments with a high-speed motor, at speeds from 500 to 2,000 revolutions per minute, or piston speeds of from 16 to 64 feet per second. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Most chose a pedaling cadence of around 60 revolutions per minute, an unstrenuous level of exertion. Well Blog: Forced Exercise's Effects on the Brain 2011-10-12T04:01:04Z The speed should be at least 1,500 revolutions per minute. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z One can count the revolutions of a machine at two or three revolutions per minute with a certain amount of accuracy, but fifty revolutions per minute are more than one could count correctly. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z This usually has three cutters revolving at very high speed, making several thousand revolutions per minute. Tobacco Leaves Being a Book of Facts for Smokers 2011-09-12T02:00:31.107Z To grind out these flaws the wheel made no less than three thousand revolutions per minute. Stories about Famous Precious Stones 2011-08-31T02:01:42.217Z This engine indicated 213 h.p. running at 105 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Thus, if a pulley has a circumference of 50 inches, and makes 120 revolutions per minute, then its velocity will be 6,000 inches per minute, because 50 × 120 = 6,000. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The pendulum swings to and fro at the rate of ninety movements a minute, while the cylinder rolls over the leather at the rate of 2780 revolutions per minute. Inventions in the Century 2011-07-20T02:00:14.643Z In theory, the fuse in each goes off when they reach a certain number of revolutions per minute. Toys of war 2011-05-17T01:45:13Z Murdoch’s model is said to have run from 6 to 8 miles an hour, its little driving-wheels making from 200 to 275 revolutions per minute. A History of the Growth of the Steam-Engine 2011-04-21T02:00:53.240Z This engine was stated to run with perfect regularity at 60 revolutions per minute, consuming 17.6 cub. ft. of hydrogen gas per hour. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The speed at which they should be run is about 2,500 for the largest, and up to 4,500 revolutions per minute for the smaller sizes. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z When going at full speed these engines conferred 425 revolutions per minute on the two gigantic propellers that drove the machine along. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z In this case the smooth rolls travelled at 23 revolutions per minute. The Preparation of Plantation Rubber 2011-03-09T03:00:40.870Z Silva says the braiders, spinning at 300 revolutions per minute, heat the shoelace tips so they don't fray—as opposed to attaching plastic ends that are less durable. Why the Private Sector Still Isn't Hiring 2011-01-13T22:00:00Z In the researchers' experiments, large swarms of bacteria, roughly 20 billion per cubic centimeter, turned the gears at a speed of about one to two revolutions per minute. Crowd Forcing: Random Movement of Bacteria Drives Gears 2011-01-10T07:45:11.230Z The following table shows the revolutions per minute for drills from 1⁄16 in. to 2 in. diameter, as usually applied:— Diameterof Drills. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This is the instrument that shows the number of revolutions per minute, or R.P.M.’s that the engine is making. Famous Flyers And Their Famous Flights 2010-12-25T03:00:15.953Z The intermediate and smooth rolls can be arranged to travel more quickly, but the maximum comfortable speed for proper feeding and control appears to be about 25 revolutions per minute on even-speed rolls. The Preparation of Plantation Rubber 2011-03-09T03:00:40.870Z Substituting these values for A and P in the formula, together with the length of stroke and average number of revolutions per minute, the indicated horsepower is easily computed. Steam Engines Machinery's Reference Series, Number 70 2010-12-20T17:12:10.227Z In our testing, launch angles ranged from 26 to 38 degrees and spin rates 3,100 to 7,000 revolutions per minute. Hot List Golf Balls: The Process 2010-05-05T04:00:00Z I say "vinyl", not "LP" because those records spun at 78 revolutions per minute. A fond farewell to the floppy disk 2010-04-27T13:00:00Z As a result, Mr. Kittinger’s body went into a spin that reached 120 revolutions per minute as he plummeted more than 60,000 feet. Findings: Chasing the Sound Barrier, in a Leap From 23 Miles Up 2010-03-15T22:40:00Z It also delivers a very substantial 650 lb.-ft. of torque starting at 2,000 revolutions per minute, which basically means you could drag an office building behind this truck without straining the engine. 2007-03-08T18:44:00Z It made 160 revolutions per minute; but the consumption of coal was of course correspondingly greater, almost twice as much as usual. Farthest North Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896 The term cutting speed should not be confused with revolutions per minute, because the cutting speed depends not only upon the speed of the work but also upon its diameter. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The speed of rotation is from 300 to 800 revolutions per minute, depending on the character of the rock and diameter of the bit. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" I had my wife sing the familiar Scotch ballad, "Comin' through the Rye," to the phonograph while the cylinder was rotating at the rate of about forty revolutions per minute. The Speech of Monkeys The motor is of a 4-pole type and compound wound, the shunt winding limiting the speed on light load to not more than 1000 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The largest variation recorded in the two trials of which full details are given, was 4-9� F. in two minutes in the outflow temperature, and four or five revolutions per minute on the speed. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" This reduction is made in one passage of the two tools, with a feed of 1/32 inch per revolution and a speed of 60 revolutions per minute. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The pump was 3� ft. in diameter, and made about 230 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7 "Drama" to "Dublin" At the earth it made in the shade thirty-five revolutions per minute. The Galaxy, April, 1877 Vol. XXIII.—April, 1877.—No. 4. There is of course a speed at which the efficiency of both types is about equal, and that is at 150 revolutions per minute for conveyors 4 to 6 in. in diameter. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Simply because the velocity of this top, being several millions of revolutions per minute, is greater than his ignorant eye can comprehend. The Orpheus C. Kerr Papers. Series 3 The axle revolves, while being turned, at 110 revolutions per minute and a feed equivalent to 1 inch of tool travel to 60 revolutions of the work is used. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Each machine was capable of raising about 1300 tons of material per day, the engines working at 60 and the pump at 180 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7 "Drama" to "Dublin" The rev.-counter showed that the number of revolutions per minute had fallen off appreciably. Cavalry of the Clouds We will hold that spin until balance is complete, when the spin will slowly be raised to two revolutions per minute, giving .15 gee on the rim deck. Where I Wasn't Going Since less air could flow into the cylinders, the force of their explosions was reduced, which, in turn, lowered the idling revolutions per minute. The First Airplane Diesel Engine: Packard Model DR-980 of 1928 Moreover, the 78 revolutions per minute obtained from the slow train of gearing, gives about 41 feet per minute on a diameter of 2 inches. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The pump was driven by a double-cylinder engine, having cylinders of 9 in. diameter by 10 in. stroke, and making 120 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7 "Drama" to "Dublin" It is quite a usual practice to have them making about 8000 revolutions per minute, and sometimes a speed of 10,000 is attained by them. The Story of the Cotton Plant According to program, acceleration will begin at zero, and the rim is expected to reach .009 gee at one-half revolutions per minute in the first sixty seconds of operation. Where I Wasn't Going Both engines attained the then high revolutions per minute of 2000 and proved efficient and durable. The First Airplane Diesel Engine: Packard Model DR-980 of 1928 The brick rattler consists of a barrel of 14 sides 24 inches long, mounted so as to rotate at a speed between 29.5 and 30.5 revolutions per minute. American Rural Highways The propellers were lowered until they nearly reached the shoals, and were then worked at 150 revolutions per minute. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 7 "Drama" to "Dublin" But even so, it may make as many as 30,000 revolutions per minute. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use At a speed of 230 revolutions per minute it delivers the air at a pressure of 43 millimeters of mercury, forcing it through the purifying vessels at the rate of 75 liters per minute. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man Thus, a turbine revolving at about 3000 revolutions per minute would be closed down at, say, 3500, which would be within the limit of "safe" speed. Steam Turbines A Book of Instruction for the Adjustment and Operation of the Principal Types of this Class of Prime Movers Blast is supplied from eight Baker rotary pressure blowers driven by engines sixteen inches by twenty-four inches, at 110 revolutions per minute. The Johnstown Horror!!! or, Valley of Death, being A Complete and Thrilling Account of the Awful Floods and Their Appalling Ruin A description was then given of the main series of trials, all at four hundred revolutions per minute, of the appliances used, and of the means taken to insure accuracy. Scientific American Supplement, No. 647, May 26, 1888 A dynamo with a rated speed of 1,500 revolutions per minute, for 110 volts, will actually attain this voltage at as low as 1,200 r.p.m. if all the regulating resistance be cut out. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Small steam engines, it is stated, have attained 600 revolutions per minute. James Watt He gives the Savannah's boiler pressure as 2 to 5 pounds per square inch and the maximum revolution of the wheels as 16 revolutions per minute. The Pioneer Steamship Savannah: A Study for a Scale Model United States National Museum Bulletin 228, 1961, pages 61-80 Then the Chief took Joe’s place, and under his hand the seemingly static disks—which were actually spinning at forty thousand revolutions per minute—turned obediently and without any appearance of the spectacular. Space Platform The mixers were of the cube type 4 ft. on each edge and operated by a 7×12-in. double cylinder engine at nine revolutions per minute. Concrete Construction Methods and Costs In machines for isolated plants, it will be found that the speed varies from 400 revolutions per minute, to 1,800, according to the design of dynamo used. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine He found that at seventy-five revolutions per minute the Montana would log off about the same speed that the freighter made when doing her best. Blow The Man Down A Romance Of The Coast - 1916 The necessity for accuracy in this timing device is clear, when one remembers that the propeller turns over at a normal rate of between fifteen hundred and nineteen hundred revolutions per minute. High Adventure A Narrative of Air Fighting in France I used about 40 ounces, and drilled a hole 3/32 in diameter in flint glass at a speed of 900 revolutions per minute to a depth of one-eighth of an inch in eight minutes. On Laboratory Arts Each batch of concrete, consisting of about 1.2 cu. yds. in place, was turned in the mixer for not less than 2 mins. at the rate of 9 revolutions per minute. Concrete Construction Methods and Costs For a considerable part of the way the paddles were working easily at from nine to ten, and the screw at from thirty-two to thirty-four revolutions per minute. Man on the Ocean A Book about Boats and Ships For at that moment there was a sharp ting upon the gong just overhead, which the engineer responded to by seizing the lever and altering the number of revolutions per minute of the screw. Steve Young The propeller was turning over at twelve hundred revolutions per minute without the slightest fluctuation. High Adventure A Narrative of Air Fighting in France When on the measured mile a mean speed of about 15¼ knots was obtained with an indicated horse power of 2200, the engines running at 90 revolutions per minute. Scientific American Supplement, No. 1157, March 5, 1898 The latter is 81/2 feet in diameter, and turns at the rate of 300 revolutions per minute. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. In that case your mandrel will revolve 960 revolutions per minute, which is ample speed for your purposes. Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations The number of revolutions per minute will of course vary with the diameter of the saw. Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures Disk saws cut metal like butter by the seemingly impractical method of spinning at 20,000 revolutions per minute. Space Tug It is driven by a 220-volt motor connected to a tachometer which reads both meters per second and revolutions per minute. Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 An engine of this kind will work well under a steam pressure of 50 lb., and it may be run at the rate of 200 to 250 revolutions per minute. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. I found that it was a 5�7 cylinder, working with very little expansion 430 revolutions per minute, with 90 pounds of live steam, in a boiler not 15 feet from the engine. Scientific American Supplement, No. 315, January 14, 1882 They will operate at best efficiency when indicating 400 horse power at a speed of 150 revolutions per minute with a steam pressure of 175 pounds at the throttle. The New York Subway Its Construction and Equipment The velocity of the wheels at 9,200 revolutions per minute is 150 ft. per second, or 39.9 per cent. of the mean velocity due to the head throughout the turbines. Scientific American Supplement, No. 633, February 18, 1888 The screw makes 200 revolutions per minute, and gives the yacht a speed of 6� knots. Scientific American Supplement, No. 623, December 10, 1887 For example, creamers which are small and light make 4,000 revolutions per minute, though the latest styles run much more slowly. Scientific American Supplement, No. 613, October 1, 1887 The illustration shows a cooler having a basket three feet in diameter, revolving at 300 revolutions per minute, and discharging into a tank 40 ft. square. Scientific American Supplement, No. 441, June 14, 1884. The alternators are of the three-phase type, making 1,200 revolutions per minute and delivering current at a frequency of 60 cycles per second at a potential of 11,000 volts. The New York Subway Its Construction and Equipment And there was Brennan, his face red with the chill wind sweeping in from the Nore, his voice plaintive and Irish, discoursing, at slow length, of revolutions per minute, of "precession," and the like. How To Write Special Feature Articles A Handbook for Reporters, Correspondents and Free-Lance Writers Who Desire to Contribute to Popular Magazines and Magazine Sections of Newspapers Hence the dynamo, with its maximum load, must revolve at 588 revolutions per minute, and exert a couple of forty-seven foot-pounds. Scientific American Supplement, No. 388, June 9, 1883 Speed Engine and Dynamo.—A high speed compound engine, running at 500 revolutions per minute, with direct-driven dynamo for electric lighting.—3 illustrations VIII. Scientific American Supplement, No. 841, February 13, 1892 The engine begins to work a quarter of a minute or so after the lamp is lit, and increases its speed up to a certain point, say 300 revolutions per minute. Things To Make The engine was then set in motion at 100 revolutions per minute. Scientific American Supplement, No. 483, April 4, 1885 With this engine a speed of 5,000 revolutions per minute is easily attainable, while, as a matter of fact and curiosity, a speed of 8,000 revolutions per minute has been obtained. Scientific American Supplement, No. 470, January 3, 1885 The angular velocity of the axle corresponding to a speed of seven miles an hour, is 84 revolutions per minute. Scientific American Supplement, No. 388, June 9, 1883 The engine is carefully balanced to enable it to run at the very high speed of 500 revolutions per minute. Scientific American Supplement, No. 841, February 13, 1892 The roller is revolved with a velocity of from 100 to 150 revolutions per minute, whereby the rags are sucked in between the roller and the back fall and cut and torn between the knives. Scientific American Supplement, No. 821, September 26, 1891 The sea smooth; and the engine, after being well coaled, made 14 revolutions per minute. Journal of a Voyage across the Atlantic It was found to be 160 revolutions per minute. The Tinguian Social, Religious, and Economic Life of a Philippine Tribe In some the loom beam rotates at a fixed number of revolutions per minute, while in others the beam rotates at a gradually decreasing number of revolutions per minute. The Jute Industry: from Seed to Finished Cloth A 6 in. spiral delivers 800 bushels per hour at 100 revolutions per minute, and more in proportion at higher speeds. Scientific American Supplement, No. 586, March 26, 1887 The revolutions per minute have increased in the ratios of 100, 105, 114; and the piston speeds as 100, 124, 140. Scientific American Supplement, No. 821, September 26, 1891 The use of rapidly rotating machinery in electric lighting has created a demand for engines running from 400 to 1,200 revolutions per minute, and capable of being coupled directly to a dynamo machine. Scientific American Supplement, No. 481, March 21, 1885 Sixty revolutions per minute is equal to 120 strokes, or two strokes per second. Scientific American Supplement, No. 799, April 25, 1891 A start was made down the river at 11:15 A.M., the engines making about 180 revolutions per minute, and the boat running at some 11½ or 12 knots. Scientific American Supplement, No. 595, May 28, 1887 A little 4 in. spiral delivers 200 bushels per hour at 100 revolutions per minute. Scientific American Supplement, No. 586, March 26, 1887 The frame makes about 180 revolutions per minute, that is, this is the number of turns put into the twist in this time. Scientific American Supplement, No. 446, July 19, 1884 The resistance when making 120 revolutions per minute is 2,810 million ohms. Scientific American Supplement, No. 481, March 21, 1885 It is of 100 indicated h.p., and its normal angular velocity is 100 revolutions per minute. Scientific American Supplement, No. 799, April 25, 1891 Although two 6 ft. screws were revolving at nearly 400 revolutions per minute almost under foot, not a bubble of air came up to break the surface. Scientific American Supplement, No. 595, May 28, 1887 At this rate of revolution, in one second the body will revolve through 325°, which is at the rate of 54.166 revolutions per minute. Scientific American Supplement, No. 531, March 6, 1886 The single propeller, which was ten feet in diameter, gave a minimum thrust of one thousand pounds at two thousand revolutions per minute. Tom Swift and His Sky Racer, or, the Quickest Flight on Record The engine, which is the invention of the Wright brothers, weighed, approximately, 200 pounds, and gave about 25 horsepower at 1,400 revolutions per minute. Flying Machines: construction and operation; a practical book which shows, in illustrations, working plans and text, how to build and navigate the modern airship A 60 horse-power engine was also made, having four vertical cylinders, each with a diameter of 5.5 inches and stroke of 5.75 inches, developing its rated power at 1,100 revolutions per minute. A History of Aeronautics It was operated by an electric motor, which was capable of driving a screw of large dimensions at forty-eight revolutions per minute. The Dominion of the Air; the story of aerial navigation If at 54.166 revolutions per minute the centrifugal force of a body is equal to its weight, what will its centrifugal force be at one revolution per minute in the same circle? Scientific American Supplement, No. 531, March 6, 1886 At the Pearl Street station, however, the machines were supported upon long iron floor-beams, and at the high speed of 350 revolutions per minute, considerable vertical vibration was given to the engines. Edison, His Life and Inventions Flying, the motor turns at about 800 revolutions per minute, delivering 180 pounds pull. Flying Machines: construction and operation; a practical book which shows, in illustrations, working plans and text, how to build and navigate the modern airship Seguin designed his first Gnome rotary as a 34 horse-power engine when run at a speed of 1,300 revolutions per minute. A History of Aeronautics The propellers, built of wood, make 350 revolutions per minute, and are set as closely as possible to the centre of resistance. Aeroplanes and Dirigibles of War It is suited for the highest speeds, and this is very necessary, as the motors may with advantage, run at 2,000 revolutions per minute. Scientific American Supplement, No. 417, December 29, 1883 This continues until the speed of rotation has increased to about 60 revolutions per minute. The Dancing Mouse A Study in Animal Behavior If the ring were making 300 revolutions per minute, and the traveler 6,000, the strain on the latter would be equal to 5,700 revolutions on a stationary ring. Scientific American Supplement, No. 362, December 9, 1882 Ignition of the engine is by means of two Bosch ZH6 magnetos, driven at a speed of 2,175 revolutions per minute when the engine is running at its normal speed of 1,450 revolutions. A History of Aeronautics The pulleys, M and L, are 0.31 of a meter in diameter, and make 80 revolutions per minute. Scientific American Supplement, No. 360, November 25, 1882 The current is generated by a dynamo machine fixed outside the mine, and run by a small rotary steam engine, shown in section and elevation, at a speed of 900 revolutions per minute. Scientific American Supplement, No. 417, December 29, 1883 The velocity with which this pump runs varies from 75 to 80 revolutions per minute. Scientific American Supplement, No. 358, November 11, 1882 In regard to speed, the inventor proposed as a maximum rate, when the wind was at the tip of the bobbin, 300 revolutions per minute, but from this point the speed would diminish. Scientific American Supplement, No. 362, December 9, 1882 The experiment of placing the propeller at the stem instead of at the stern was tried, and the motor gave it a speed of 100 revolutions per minute. A History of Aeronautics The diameter of the pinion is 0.197 of a meter, and it makes 80 revolutions per minute. Scientific American Supplement, No. 360, November 25, 1882 The engine may be reduced in weight by reducing its size, and this can only be done by increasing the number of revolutions per minute. Scientific American Supplement, No. 299, September 24, 1881 It is a new thing that a cold air machine may be run at any speed from 32 to 120 revolutions per minute. Scientific American Supplement, No. 288, July 9, 1881 In regard to speed, the inventor proposed as a maximum rate, when the wind was at the tip of the bobbin, 300 revolutions per minute, but from this point the speed would diminish. Scientific American Supplement, No. 362, December 9, 1882 A later development of the Green engine was a six-cylindered vertical, cylinder dimensions being 5.5 inch diameter by 6 inch stroke, developing 120 brake horsepower when running at 1,250 revolutions per minute. A History of Aeronautics It is of the single cylinder, horizontal, condensing type, with one cylinder 40 inches diameter, and 10 feet stroke, and makes forty-five revolutions per minute, corresponding to a piston speed of 900 feet per minute. Scientific American Supplement, No. 286, June 25, 1881 In 1855 I have again used expansion valves of this construction in engines making one hundred revolutions per minute, and with perfectly satisfactory results.-- A Catechism of the Steam Engine It can, however, be run at as high a speed as 140 revolutions per minute. Scientific American Supplement, No. 288, July 9, 1881 I ought to get a few hundred more revolutions per minute out of the motor with the way I've adjusted the magneto. Tom Swift in Captivity, or a Daring Escape By Airship The rated power of each type of engine is obtained at 1,200 revolutions per minute, and for all four sizes the cylinder bore is 4.13 inches, with a 5.5 inches piston stroke. A History of Aeronautics The rate, or speed, of revolution of this revolving furnace obviously depends upon the character of the ore under treatment; it may vary from two revolutions per minute down to one revolution in thirty minutes. Getting Gold: a practical treatise for prospectors, miners and students Half the hand mules were spinning 36's weft, at 4700 revolutions, and the other half 36's twist at 5000 revolutions per minute. A Catechism of the Steam Engine The furnaces were urged into greater activity; our propeller did forty–three revolutions per minute, and steam shot from the valves. Twenty Thousand Leagues Under the Sea A propeller seven feet in diameter with a six foot pitch, turning 950 revolutions per minute, will produce a pull of 350 pounds, if properly made. Aeroplanes Cylinder dimensions of this engine were 3.94 inches bore by 5.12 inches stroke, and a power output of 50 horse-power was obtained when working at a rate of 1,200 revolutions per minute. A History of Aeronautics All three sizes were constructed to run at 1,200 revolutions per minute. A History of Aeronautics Another rule is to multiply the square of the number of revolutions per minute by the diameter of the circle in feet, and to divide the product by 5,870. A Catechism of the Steam Engine The best known of these was the 30 horse-power size, which had cylinders of 4.7 inches diameter by 5.1 inches stroke, and gave its rated power at 1,200 revolutions per minute. A History of Aeronautics A propeller, 15 feet in diameter, was driven by the Lenoir engine at 40 revolutions per minute. A History of Aeronautics By accelerating up to 1,200 revolutions per minute 70 brake horsepower could be obtained, and a maximum of 80 brake horse-power was actually attained with the type. A History of Aeronautics |
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