| 单词 | parabolic reflector |
| 例句 | Louis XIV was fascinated by parabolic reflectors, concave mirrors that reflect and intensify the sun. How Do You Add to Versailles? Bravely 2016-08-05T04:00:00Z For instance, given the diameter and focus of a cross-section of a parabolic reflector, we can find an equation that models its sides. Algebra and Trigonometry 2015-02-13T00:00:00Z But a parabolic telescope must be steerable and able to point at astronomical objects and track them as Earth rotates, because parabolic reflectors distort waves from off-axis targets. World’s largest radio telescope will search for dark matter, listen for aliens 2016-09-26T04:00:00Z At any distance the beam from the parabolic reflector will be more intense than that from the spherical one, since the rays will be closer together. 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 The light is produced by twenty-one parabolic reflectors of copper, plated with silver, and having each an argand lamp in its focus. Curiosities of Great Britain: England and Wales Delineated Vol.1-11 Historical, Entertaining & Commercial; Alphabetically Arranged. 11 Volume set. 2011-09-26T02:00:29.140Z This arc lamp T is placed at the focus of a parabolic reflector R, from which the light is reflected in a parallel beam to the receiving station. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 Camol left the laboratory and returned with a large coil on the top of which was mounted a parabolic reflector. Astounding Stories, August, 1931 Rick turned and looked at the radio telescope at Sahara Wells, its great parabolic reflector gleaming in the brilliant moonlight. The Egyptian Cat Mystery These wheels," he was saying, "line up the parabolic reflector with the Pluto signal, you see. Hanging by a Thread A gang of men were hard at work erecting a huge parabolic reflector in the center of the circle, about the periphery of which the infra-red reflectors were placed. Astounding Stories of Super-Science September 1930 In the marine searchlight a powerful arc lamp is arranged with the arc at the focus of a parabolic reflector, which sends all reflected light forward in a pencil of parallel rays. 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 Headlamps of commercial manufacture were carefully finished and made with parabolic reflectors, elaborate burners, and handsomely fitted cases. The 'Pioneer': Light Passenger Locomotive of 1851 United States Bulletin 240, Contributions from the Museum of History and Technology, paper 42, 1964 Ham radios all over North America picked up his speech, which was made by spreading the beam from an eighty-foot diameter parabolic reflector and aiming it at Earth from a hundred thousand miles out. By Proxy As our marine increased greater skill was invoked, and lamps reinforced by parabolic reflectors poured their light upon the sea. Fragments of science, V. 1-2 The sound waves are thrown upward and are directed into the Auditorium by means of parabolic reflectors constructed of cement lined with wood. The Recent Revolution in Organ Building Being an Account of Modern Developments The island, perhaps ten miles long and half that in width, was entirely covered with great parabolic reflectors, arranged so closely together that little could be seen between them. Skylark Three Stevens had poised the "Forlorn Hope" edgewise in mid-air, so that the gleaming, heavily armored parabolic reflectors of his projectors, mounted upon the leading edge of the fortress, covered the scene below. Spacehounds of IPC They can be reflected by plain sheets of metal, concentrated by parabolic reflectors, refracted by prisms, concentrated by lenses. Scientific American Supplement, No. 717, September 28, 1889 Guns of various forms and sizes have been invoked for gunpowder, while gun-cotton has been fired in free air and in the foci of parabolic reflectors. Fragments of science, V. 1-2 The type of parabolic reflector now in use does not differ essentially from that of an automobile head-lamp, excepting that it is larger. Artificial Light Its Influence upon Civilization Soon the two vessels were almost side by side, moving cautiously forward, and Seaton set up a sixty-inch parabolic reflector, focused upon a coil. Skylark Three This last theorem is the basis for the construction of the parabolic reflector. An Elementary Course in Synthetic Projective Geometry In the passage it was too dark to see either his finger-tips or the minute texture of his hair; but my candle-lamp, with its parabolic reflector, would give ample light. The Uttermost Farthing A Savant's Vendetta The "Thumbograph" having been fixed in position, the light from a powerful incandescent gas lamp, fitted with a parabolic reflector, was concentrated on it, and the camera racked out to its proper distance. The Red Thumb Mark Spherical reflectors were introduced in about 1780 and parabolic reflectors about ten years later. Artificial Light Its Influence upon Civilization In the first case a single lens or a parabolic reflector suffices, but in the second case a cylindrical lens which condenses the light vertically into a horizontal sheet of light is essential. Artificial Light Its Influence upon Civilization Although the metallic parabolic reflector is used in the most powerful search-lights, there have been many other developments adapted to warfare. Artificial Light Its Influence upon Civilization In earlier geodetic surveys Argand lamps had been employed with parabolic reflectors and with convex lenses, but apparently these did not have a sufficient range. Artificial Light Its Influence upon Civilization |
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