| 单词 | refracting telescope |
| 例句 | In a reflecting telescope the image is magnified by a curved mirror, while in a refracting telescope it is magnified by passing through a lens. The Invention of Science 2015-09-17T00:00:00Z Recall her decorating cakes near the refracting telescope, her dress in the wind. The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume I: The Pox Party 2006-09-12T00:00:00Z We had panes of smoked glass to peer through; and, for more precise accuracy, a refracting telescope trained upon a piece of paper, so that the image was cast down upon it. The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume I: The Pox Party 2006-09-12T00:00:00Z Your telescope is a "refracting telescope," because it uses lenses to help gather more light than your eye could possibly do on its own. Make a telescope 2015-03-03T05:00:00Z The Lowell Observatory’s major instrument was a 24-inch refracting telescope, which was not at all well suited to observations of faint spiral nebulae. Astronomy 2016-10-13T00:00:00Z It would make for a fantastic dance floor, but the 37.5-ton platform’s sole purpose at Yerkes Observatory in Williams Bay is to provide convenient access to the world’s largest refracting telescope. New stewards for Yerkes Observatory offer expanded vision 2020-06-29T04:00:00Z Inside one small dome is a beautiful, vintage refracting telescope with an exquisite lens. As the sun makes a star turn, America’s greatest observatory carries on 2017-08-11T04:00:00Z As Pennington puts it, “the media behave like a cheap refracting telescope, focusing on an object of interest but magnifying it with a good deal of aberration and fuzziness at the edges”. Bacteriology: Pathogens in perspective : Nature : Nature Publishing Group 2015-10-20T04:00:00Z Its normal magnitude is 10, but at minimum it becomes invisible in a 7½-inch refracting telescope. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z However, there is a limit to the size of a refracting telescope. Astronomy 2016-10-13T00:00:00Z Newton indeed, who was expert in optics, gave up the problem of improving the refracting telescope, and turned his energies toward the reflector. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z In reflecting telescopes, therefore, mirrors are used in order to bring the image nearer the eye; and a lens, or eye-glass, the same as in the refracting telescope, to magnify the image. Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained 2011-07-12T02:00:28.027Z On taking charge of the Lick Observatory in 1898, I decided to devote my own observing time to the Crossley reflector, although the whole of my previous experience had been with refracting telescopes. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z It is a curious fact that the performance of a really good refracting telescope actually exceeds what theory would indicate! at least so far as double stars are concerned. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z Currently, the largest refracting telescope is the 40-inch refractor at Yerkes Observatory in Wisconsin. Astronomy 2016-10-13T00:00:00Z He devoted his attention to the improvement of refracting telescopes, and succeeded in constructing object-glasses in which the refrangibility of the rays of light was corrected. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z In Fig. 42, which represents the largest and one of the most perfect refracting telescopes ever built, let the student pick out and identify the several parts of the mounting above described. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z In what is said above I refer, of course, to the refracting telescope, which is the form of instrument that I should recommend to all amateurs in preference to the reflector. 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 production of colour takes place usually near the edges of a lens; and, as will be recollected, proved very obnoxious to the users of the old form of refracting telescope. Astronomy of To-day A Popular Introduction in Non-Technical Language Light enters a refracting telescope through a lens at the upper end, which focuses the light near the bottom of the telescope. Astronomy 2016-10-13T00:00:00Z Though not the inventor, he was the first to construct a refracting telescope and apply it to astronomical research. The Astronomy of Milton's 'Paradise Lost' The development given to the refracting telescope by this extraordinary man was indispensable to the progress of that fundamental part of astronomy which consists in the exact determination of the places of the heavenly bodies. A Popular History of Astronomy During the Nineteenth Century Fourth Edition 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 It was erected in 1896–7, and is the largest refracting telescope in the world. Astronomy of To-day A Popular Introduction in Non-Technical Language One problem with a refracting telescope is that the light must pass through the lens of a refractor. Astronomy 2016-10-13T00:00:00Z In that year Mars made an exceptionally near approach to the earth, and Professor Asaph Hall, of Washington Observatory, took up the search, using a splendid refracting telescope having an object-glass 26 inches in diameter. To Mars via The Moon An Astronomical Story A refracting telescope loses, besides, one of its chief advantages over a reflector when its size is increased beyond a certain limit. A Popular History of Astronomy During the Nineteenth Century Fourth Edition In other words, you have constructed a simple 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 It is also to be noticed that such objects are a little out of the stellar focus in the refracting telescope in consequence of their blue colour. The Story of the Heavens Telescopes designed with mirrors avoid the problems of refracting telescopes. Astronomy 2016-10-13T00:00:00Z A refracting telescope consists of an object-glass composed of two or more lenses, mounted at the upper end of a tube, which is pointed at the celestial object. The New Heavens For this reason work of precision must remain the province of refracting telescopes, although great reflectors retain the primacy in the portraiture of the heavenly bodies, as well as in certain branches of spectroscopy. A Popular History of Astronomy During the Nineteenth Century Fourth 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 Greenwich time on February 17th, 1897, through a powerful refracting telescope. The Story of the Heavens Hale realized that 40 inches was close to the maximum feasible aperture for refracting telescopes. Astronomy 2016-10-13T00:00:00Z The world's work in astronomy was done mainly with refracting telescopes. The Reminiscences of an Astronomer It is, however, in the construction of refracting telescopes that the most conspicuous advances have recently been made. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Meanwhile the production of refracting telescopes made but slow progress. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World When Galileo completed his little refracting telescope, which, though it only magnified thirty times, was yet an enormous addition to the powers of unaided vision, he made with it his memorable review of the heavens. The Story of the Heavens A daguerreotype plate was placed at the focus of the 15-inch equatorial, at that time one of the two largest refracting telescopes in the world. The Future of Astronomy At that time Cooke and Clark were the only two men who had ever succeeded in making refracting telescopes of the largest size. The Reminiscences of an Astronomer This is the grand principle of the refracting telescope. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work To this period also belongs the construction of the Cambridge Observatory, with its fifteen-inch refracting telescope. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World Let me first describe in general terms the nature of a comet, in so far as its structure is disclosed by the aid of a powerful refracting telescope. The Story of the Heavens For nearly one hundred and fifty years all refracting telescopes labored under one serious difficulty. Scientific American Supplement, No. 832, December 12, 1891 It is still an open question, perhaps, whether a great refracting telescope will last unimpaired for an indefinite length of time. The Reminiscences of an Astronomer In either case the image may be magnified, as in the refracting telescope. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work 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 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 Professor Gazen silently turned the great refracting telescope in the direction of Mars, and peered attentively through its mighty tube for several minutes. A Trip to Venus Mr. Hilgard replied that the statement was quite correct, the observatory having been equipped at a time when the construction of great refracting telescopes had not been commenced, and even their possibility was doubted. The Reminiscences of an Astronomer 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 In Port Lincoln, I observed an eclipse of the sun with a refracting telescope of forty-six inches focus, and a power of about two hundred. A Voyage to Terra Australis — Volume 1 The student who uses a good refracting telescope, having an object-glass not less than three inches in diameter, will find occupation for many a fine evening. The Story of the Heavens In 1882, he supplied the Russian Government with the largest refracting telescope in existence the object-glass being of thirty inches diameter. Men of Invention and Industry There, you see a double refracting telescope: for two sous, you enjoy its effect. Paris as It Was and as It Is The large refracting telescopes have been constructed within the last few decades. Outline of Universal History Silvered glass reflectors made in this way are extensively manufactured in London, and are far cheaper than refracting telescopes of corresponding size. Side-Lights on Astronomy and Kindred Fields of Popular Science If a refracting telescope is to be used for taking celestial photographs, the lenses of the object-glass must be specially designed for this purpose. The Story of the Heavens This refracting telescope did not long remain the largest. Men of Invention and Industry In this way Newton accounted for a great part of the difficulties which had hitherto beset the attempts to construct a perfect refracting telescope. Great Astronomers It may, however, be mentioned that the kind of instrument which Herschel designed to construct was formed on a very different principle from the refracting telescopes with which we are ordinarily familiar. Great Astronomers We have thus far spoken only of the refracting telescope, because it is the kind with which an observer would naturally seek to supply himself. Side-Lights on Astronomy and Kindred Fields of Popular Science There has, indeed, been some honourable rivalry between the various civilised nations as to which should possess the greatest refracting telescope. The Story of the Heavens It may be added that Thomas Cooke revived the art of making refracting telescopes in England. Men of Invention and Industry The only known method for getting over the peculiar difficulties presented in the construction of the refracting telescope, was to have it of the most portentous length. Great Astronomers |
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