| 单词 | achromatic |
| 例句 | The principal’s office was a cramped, achromatic cubicle separated from the library door by a glass trophy case that overflowed with the gilded booty of athletics earned over the past thirty years. The Great Santini 1976-01-01T00:00:00Z “He makes the decision to more or less abandon color and make these achromatic paintings with incredible permutations within them,” she said. Jack Whitten’s ‘Lost Chapter,’ Now at Dia:Beacon 2022-12-28T05:00:00Z Unlike some of the artist’s best-known works, which wow with saturations and transformations of color, “Avaar” is achromatic — using only white light. Catskill Art Space Opens With James Turrell and a Lofty Vision 2022-10-19T04:00:00Z A more detached and specialised register follows: "subjective/ or optical colours", "achromatic". Poem of the week: The Coloration of Feathers by Ruth Fainlight 2012-02-13T09:34:36Z Instead, brown, gray, beige and white are dominant, an achromatic palette whose gloomy drabness is only relieved by the surprisingly wide variety of neutrals the artist employs. Review: A Getty show of Giacomo Ceruti's 18th-century paintings reveals much about our modern wealth gap 2023-07-31T04:00:00Z The moneyed, achromatic 2010s could give way to a more fascinating and unpredictable cultural landscape, with once marginalized communities asserting themselves. New York faces an unprecedented crisis. Will the city I love survive Covid-19? | Ross Barkan 2020-06-22T04:00:00Z Such symmetrical and achromatic light curves are in agreement with what is expected for microlensing events. Twenty-five years of using microlensing to study dark matter 2018-10-15T04:00:00Z It must be remembered, however, that when Dollond expressed preference for this third type he had not then invented the achromatic object-glass. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The achromatic figure, formed in mitotic cellÐdivision, consisting of two asters connected by a spindleÐshaped bundle of rodlike fibers diverging from each aster, and called the spindle. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z A power of four or five hundred diameters is sufficient for the recognition, and the object should be illuminated with a flood of light through a large diaphragm or an achromatic condenser. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z The second step towards this grand achievement of science was the construction of the double achromatic combination of lenses by J. Dolland. The Evolution of Photography With a Chronological Record of Discoveries, Inventions, etc., Contributions to Photographic Literature, and Personal Reminescences Extending over Forty Years 2012-02-15T03:00:30.577Z While these changes have been proceeding in the nucleus, changes in the cytoplasm have resulted in the formation of the achromatic figure. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z This was applied to an excellent achromatic telescope of 3� in. aperture and 42 in. focal length. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z See Prism, Ð Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The construction of achromatic telescopes depends upon this principle. Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry 2011-10-11T02:01:05.817Z Each may continue to supplement the other, till the red, green, blue and yellow imperfections may be fused into achromatic white, the perfect light-ray. The Browning Cyclop?dia A Guide to the Study of the Works of Robert Browning 2011-07-16T02:00:19.397Z The Achromatic Figure.—The mode of origin of the achromatic figure varies greatly. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z 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 The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The three illustrations given above afford an idea of the plan of construction of our achromatic objectives. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z Barnard in the close neighbourhood of Jupiter on the 9th of September 1892, proved representative of a small inner satellite, invisible with less perfect and powerful instruments than the Lick 36-in. achromatic. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" The question, therefore, of the cytoplasmic or nuclear origin of the achromatic figure, at one time regarded as of considerable importance, is wholly immaterial. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z The eye is not perfectly achromatic, the colours of the rose and tulip are not pure colours, and the freshest air of our hills has a bit of poison in it. The Glaciers of the Alps Being a narrative of excursions and ascents, etc. Telescopes, microscopes, &c., in which the glasses are thus composed are called achromatic. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide The achromatic doublets have a very large, clear and flat field. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z Chromatic aberration is easily cured by using an achromatic or compound lens made by cementing together two lenses of crown and flint glass respectively, as in Fig. Optical Projection Part 1: Projection of Lantern Slides 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" It is fitted with the No. 0 Ball Bearing shutter, speed 1/50 of a second, with cable release, as described on page 6, and offers the choice of rapid rectilinear or meniscus achromatic lens. Kodaks and Kodak Supplies 1914 In addition to the double lens fittings these cameras are also offered with single meniscus achromatic lenses for those who prefer compact folding cameras requiring but little adjustment of focus for objects at different distances. Premo Cameras 1914 The outfits comprised in the following pages are made up with achromatic objectives, which suffice for all ordinary needs. Microscopes and Accessory Apparatus Catalogue No. 40 2011-04-14T02:00:42.743Z This lens really consists of two achromatic combinations, the pair at the front being cemented together, and that at the rear having an air space between. Optical Projection Part 1: Projection of Lantern Slides This conclusion was proved to be erroneous when Chester M. Hall in 1733 constructed achromatic lenses. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The camera is furnished with either meniscus achromatic or rapid rectilinear lens. Kodaks and Kodak Supplies 1914 If not, the substitution of an achromatic lens will be of no advantage. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Photographic Query.—Given the diameter and focal length of a simple achromatic lens; at what distance from it must a diaphragm of given diameter be placed to give the best possible image? Notes and Queries, Number 235, April 29, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. The achromatic arrangement of the transparent refracting mediums of the eye, remedies the aberration of refraction in the different portions of the eye. A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) A refracting telescope which has been freed from the effects of chromatic aberration is called achromatic. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers For average photography, the camera fitted with Kodak Ball Bearing shutter and tested meniscus achromatic lens is amply efficient, for it will make excellent pictures under ordinary conditions. Kodaks and Kodak Supplies 1914 A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Each kind of instrument has, indeed, its special advantages; though perhaps, on the whole, the most perfect type of telescope is the achromatic refractor. Astronomy of To-day A Popular Introduction in Non-Technical Language Such a lens is called achromatic, or colourless. 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 In this kind of eyepiece the image is formed between the two lenses, and if the work is properly done such an eyepiece is achromatic. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Within seventeen days of its identification with the Berlin achromatic, Neptune was found to be attended by a satellite. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Calculation shows that, if the aperture be 1⁄5 in., an achromatic lens has no sensible advantage if the focal length be greater than about 11 in. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" With the oil immersion objective, however, an achromatic condenser, giving an illuminating cone of about 0.9, should be used if the full value of the lens is to be obtained. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. If you hold a common reading-glass some distance away from large print you will see that the letters are edged with coloured bands, proving that the lens is not achromatic. 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 An achromatic objective in front of the eye piece brings the images of the real and artificial star to a focus in the same plane. Astronomical Instruments and Accessories But with the crown part of the designed achromatic combination things went less smoothly. A Popular History of Astronomy During the Nineteenth Century Fourth Edition In a refracting telescope we have to employ what is known as the achromatic combination, consisting of one lens of flint glass and one of crown glass, adjusted to suit each other with extreme care. The Story of the Heavens And more recently Sir David Brewster stated that Wargentin 'had in his possession a good achromatic telescope, which always showed Venus with such a satellite.' Myths and Marvels of Astronomy This wonderful lens is achromatic, and free from spherical aberration and distortion of image. 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 The glass must be achromatic;it must have a small spherical aberration for rays converging to the principal focus. On Laboratory Arts The lenses and achromatic glasses, tubes and specula, concave mirrors, and object-prisms, and the huge, rough old telescope, peering through the roof, were still there as their owner had left them. Prairie Farmer, Vol. 56: No. 3, January 19, 1884. A Weekly Journal for the Farm, Orchard and Fireside If the web of a frog's foot be placed on the stage of a microscope and examined with an achromatic lens, the chromatophores can readily be made out. The Dawn of Reason or, Mental Traits in the Lower Animals Fourthly, there is the contrast of colour and neutrality, the chromatic and achromatic, or hue and shade. Field's Chromatography or Treatise on Colours and Pigments as Used by Artists The Hippalus rill-system is a very interesting one, and the greater part of it can, moreover, be easily traced in a good 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features The author's eye seems to be a natural achromatic, divesting every object of the glare of color. Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 3 But a well-constructed achromatic of two or three inches in aperture will not merely supply amusement and instruction,—it may be made to do useful work. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. It was thus when the discovery that the refraction and dispersion of light did not follow the same law of variation, affected both astronomy and physiology by giving us achromatic telescopes and microscopes. Essays on Education and Kindred Subjects Everyman's Library I attempted to trace it with a small achromatic, but found its magnifying power not sufficient. A General History and Collection of Voyages and Travels, Volume 16 The great cleft, extending from the central mountains to the S.E. wall, and perhaps beyond, was discovered by Schroter on September 16, 1788, and can be seen in a 2 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features The two spectra do not coincide, and the result, if an achromatic lens be made of these glasses, must be a remnant of color which cannot be neutralized. Scientific American Supplement, No. 561, October 2, 1886 The negative eye-piece, being achromatic, is commonly employed in all observations requiring distinct vision only. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. A microscope with achromatic lenses can now be purchased so cheap that there is no longer any necessity of procuring one with the common lens. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Myself 0 25 37 Mr Bayly and I observed with the large achromatic telescopes, and Mr King with a reflector. A General History and Collection of Voyages and Travels, Volume 16 I have sometimes found this cleft an easy object with a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features The making of three-inch objectives, achromatic and of short focus, wrought a revolution in telescopes and renewed the demand for refractors, though prices, as compared with those of the present day, were very great. Scientific American Supplement, No. 832, December 12, 1891 It was this accuracy of convergence of the light which led Dr. Draper to prefer the mirror to the achromatic lens. The Atlantic Monthly, Volume 12, No. 69, July, 1863 In the course of his studies he made great improvements in the refracting telescope; and the achromatic telescope, which he invented, gave him a high rank among the philosophers of his age. Thrift Myself, at 2 37 44 Mr Bayly and Mr King observed with Dolland's three-and-a-half inch achromatic telescope, and with the greatest magnifying power. A General History and Collection of Voyages and Travels, Volume 16 Under suitable conditions, it can be seen as such in a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features An achromatic refracting telescope, of three and a half feet, and triple object glass, made by Mr Dollond. A General History and Collection of Voyages and Travels — Volume 14 It was 8 inches in diameter; focal length, 150 feet; not achromatic. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis Those made with achromatic glasses may be as much better as they are dearer, but we have not been able to satisfy ourselves of the fact. The Atlantic Monthly, Volume 03, No. 20, June, 1859 With all the achromatic clearness, the unromantic colourlessness of the early morning…. Love and Mr. Lewisham Both crater-row and cleft are easy objects in a 4 inch achromatic under morning illumination. The Moon A Full Description and Map of its Principal Physical Features One image is quite achromatic, the other shows a little colour. Inquiries into Human Faculty and Its Development The eye-piece consists of a single achromatic lens, whose focal length is about two inches. Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis He considers the achromatic telescope the king of instruments, and is now engaged in testing convex optical surfaces, with a view to achieving a telescope of that description. Men of Invention and Industry My father possessed a very excellent achromatic spy-glass of 2 inches diameter. James Nasmyth: Engineer; an autobiography The coarser parts of this object are easily visible in small telescopes, and may be glimpsed under suitable conditions with a 2 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features The absence of this error is termed achromatism, and an optical system so corrected is termed achromatic. The Project Gutenberg Encyclopedia Volume 1 of 28 The inner lens is an achromatic 3 1/4 inches diameter, its focal length being 30 inches. History and Practice of the Art of Photography Then there was the shoemaker and teacher, and eventually the first-rate maker of achromatic instruments. Men of Invention and Industry The air, afflicted to pallor with the hoary multitudes that infested it, twisted and spun them eccentrically, suggesting an achromatic chaos of things. Tess of the d'Urbervilles I have seen this object easily with a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features For an achromatic dispersive lens the converse must be adopted. The Project Gutenberg Encyclopedia Volume 1 of 28 If the lens be not achromatic, a chromatic aberration takes place, which produces an indistinct, hazy appearance around the edges of the picture, arising from the blending of the rays. History and Practice of the Art of Photography We had accordingly to look to foreign countries for the further improvement of the achromatic telescope, which Dollond had so much advanced. Men of Invention and Industry Frauenhofer, at the beginning of the nineteenth century, while applying Dollond’s discovery to make large achromatic telescopes, studied the dispersion of light by a prism. History of Astronomy A winding cleft crosses the valley about midway, which, strange to say, is not shown in the maps, though it may be seen in a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features These chromatic errors of systems, which are achromatic for two colours, are called the ``secondary spectrum,'' and depend upon the aperture and focal length in the same manner as the primary chromatid errors do. The Project Gutenberg Encyclopedia Volume 1 of 28 I find then calculations of achromatic eye-pieces for a very nice model with silk threads of various colours which I made with my own hands for my optical lectures. Autobiography of Sir George Biddell Airy He carried out his clock-making business with the same zeal that he devoted to the perfection of his achromatic telescopes. Men of Invention and Industry The first actual inventor and constructor of an achromatic telescope was Chester Moor Hall, who was not in trade, and did not patent it. History of Astronomy On the N. there is a winding cleft, and some short crossed clefts in the rugged surface just beyond the foot of the wall, which I have seen with a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features But a magnifying power of 400 diameters, even when definition reaches the exquisite perfection of our modern achromatic lenses, hardly suffices for the mere discernment of the smallest forms of life. Discourses Biological and Geological Essays Other subjects on my quires are: Theory of musical concords, many things relating to trigonometry and trigonometrical tables, achromatic eye-pieces, equation to the surface bounding the rays that enter my left eye, experiments on percussion. Autobiography of Sir George Biddell Airy He found that before he could make a good achromatic telescope it was necessary that he should calculate his curves from data depending upon the nature of the glass. Men of Invention and Industry One is painted with the most brilliant hues of Romanticism, and glows with the essence of the Romantic spirit--Aspiration; the other looks at life through an achromatic lens, and is a catalogue of Realities. Essays on Russian Novelists Cavendish d includes a coarse cleft on its floor, running from N. to S., which I have frequently glimpsed with a 4 inch achromatic. The Moon A Full Description and Map of its Principal Physical Features One very small achromatic telescope of the strongest make, not to exceed six inches in length, when closed: 1 pound. Successful Exploration Through the Interior of Australia In the course of a few days I received a splendid achromatic compound microscope and some books, which I duly handed over to my friend, telling him it was from an unknown hand. Life and Letters of Thomas Henry Huxley — Volume 3 The following are some of his more important achromatic telescopes. Men of Invention and Industry Possibly, in time, say a few geological ages, it might in some optician's shop have brought about a combination of flint and crown glass which, together, should have been achromatic. Darwiniana; Essays and Reviews Pertaining to Darwinism To these achromatic object glasses, as they are called, the great development of astronomical knowledge, since Newton's time, is due. Great Astronomers He did not confine his efforts to simply lengthening the focal length of his telescopes, however, but also added to their efficiency by inventing an almost perfect achromatic eye-piece. A History of Science — Volume 2 And in course of time, by his rare and exquisite manipulative skill, he succeeded in constructing a four-inch refractor, or achromatic telescope, of admirable defining power. Men of Invention and Industry |
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