| 单词 | object glass |
| 例句 | 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 What the diameter of the object glass was we do not know, perhaps two inches or possibly a little more. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z The object glass only of the telescope was used. 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 They make a cross line on my object glass. The Girl Scouts at Rocky Ledge Nora's Real Vacation 2012-01-20T03:00:14.427Z "Except that I have replaced the object glass with the lens I picked up the other day at Thaneford's crow's-nest on Sugar Loaf." In Jeopardy 2012-01-04T03:00:35.013Z Such an instrument is known as a compound or astronomical telescope, and the first lens is called the object glass and the second lens the magnifying glass, or eye-piece. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 This is conveniently done by cutting a large hole, the size of the brass cell of the object glass, through a sheet of corrugated strawboard, and slipping this on over the cell. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z The object glass is the eye of the instrument—the sensitive paper may be compared to the retina. The Pencil of Nature Small portion of the outer integument of the complemental male, as seen with a 1/8th of an inch object glass. A Monograph on the Sub-class Cirripedia With Figures of all the Species. The refractor achieves this by means of a carefully shaped lens, called the object glass, or objective. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers This is exactly what is done in the telescope; the object glass or large lens forms an image, which is then looked at through a magnifying glass or eye-piece. Pioneers of Science Professor Lowell's telescope is over 32 feet in focal length, and has an object glass of excellent quality 24 inches in diameter, the work of the celebrated Alvan Clark. To Mars via The Moon An Astronomical Story Curiously the others crowded about the object glass of the periscope. Boy Scouts in the North Sea The Mystery of a Sub He unscrewed the object glass from Voules’s telescope, but in vain tried to obtain a light. The Rival Crusoes In precisely a similar manner an image is formed at the focus of the object glass of a refracting telescope. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers The power which I usually employ magnifies but one hundred and fifty diameters; and I use the entire aperture of my object glass. The Continental Monthly, Vol. 6, No 3, September 1864 Devoted To Literature And National Policy Let us commence by taking the object glass out of its cell. On Laboratory Arts In focusing, do not allow the object glass of the microscope to come in contact with the cover glass. Human Foods and Their Nutritive Value It was speedily determined that the object glass should be shaped by the Clarks, who should also be responsible for getting the rough disks. The Reminiscences of an Astronomer In order to get around the obstacle formed by chromatic aberration it is necessary to make the object glass of a refractor consist of two lenses, each composed of a different kind of glass. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers The Moon's real diameter being known and occupying a certain space on the object glass, the exact space occupied by the shadow can be easily ascertained by means of the movable thread. All Around the Moon Any errors left over are to be attributed to other causes than the want of collinearity of the axes of object glass and eyepiece. On Laboratory Arts I have received a new microscope, a queer-looking thing, very portable; one object glass of a quarter inch focus, by Ross; two eye-pieces magnifying linearly 200 to 300 times. Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries He expressed some surprise at its modest dimensions and fittings generally, but was so well pleased with what he saw that he decided to award them the contract for making the object glass. The Reminiscences of an Astronomer Both lenses have their convex surfaces toward the object glass, and their distance apart is equal to half the sum of their focal lengths. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers 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 A. The adjusting screws of the cell mounting the object glass may be worked until the best result is attained; this requires great care and patience. On Laboratory Arts The images formed by them were more or less confused by rainbow tints, due to the bending, or refracting, by the object glass of the rays of light. Scientific American Supplement, No. 832, December 12, 1891 Of most interest to us in the present connection is the history of the 30-inch telescope of the Pulkova Observatory, the object glass of which was made by Alvan Clark & Sons. The Reminiscences of an Astronomer Suppose we turn it in such a way that the eyepiece moves slightly outside the focus, or away from the object glass. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers 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 B. Astigmatism is detected by rotating the object glass or object glass cell. On Laboratory Arts In his unrivaled book, Webb declares that his observations were chiefly made with a telescope five and one-half feet long, carrying an object glass of a diameter of three and seven-tenths inches. Scientific American Supplement, No. 832, December 12, 1891 In answering him I called his attention to the ability of Alvan Clark & Sons to make at least the object glass, the most delicate and difficult part of the instrument. The Reminiscences of an Astronomer If they are three-cornered, it is probable that the object glass is subjected to undue pressure in its cell. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Thus, portrait No. 1 is in the front of the pack; we take the cap off the object glass of the camera for ten seconds, and afterwards replace it. Inquiries into Human Faculty and Its Development The object glass is three inches; the focal length forty-three inches; and the telescope, when drawn out, with the pancratic eyepiece attached, is about four feet. Men of Invention and Industry This historic telescope has, I believe, a twelve inch object glass, but the difficulty of seeing in sunshine so minute a star is such that the fact may fairly be mentioned here. Scientific American Supplement, No. 832, December 12, 1891 I was surprised to find the object glass affected by so serious a defect that it could not be expected to do any work of the first class. The Reminiscences of an Astronomer The larger the object glass and the higher the power, the greater are the atmospheric difficulties. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers I have also used a divided lens, like two stereoscopic lenses brought close together, in front of the object glass of a telescope. Inquiries into Human Faculty and Its Development Then he began to examine the telescope, the object glass was gone! The Field of Ice Part II of the Adventures of Captain Hatteras To these he added in 1896 a telescope with 24 inch object glass, the last work of the celebrated firm of Alvan Clark & Sons, with which he has made his later discoveries. Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation The board should now be fixed by elastic bands, or by any other convenient means, upon the stage of the microscope, so as to bring the membrane of the foot under the object glass. A Practical Physiology No doubt if this had been the case, a perfect telescope could have been produced by properly shaping the object glass. Great Astronomers In such a case, no tube could be used, and the object glass was merely fixed at the top of a high pole. Great Astronomers “No, no, the object glass; the object glass out of my telescope.” The Field of Ice Part II of the Adventures of Captain Hatteras |
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