Refracting telescope
Telescope Tel"e*scope, n. [Gr. ? viewing afar, farseeing; ? far, far off + ? a watcher, akin to ? to view: cf. F. t['e]lescope. See {Telegraph}, and {-scope}.] An optical instrument used in viewing distant objects, as the heavenly bodies. [1913 Webster]

Note: A telescope assists the eye chiefly in two ways; first, by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and, secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible. Its essential parts are the object glass, or concave mirror, which collects the beam of light, and forms an image of the object, and the eyeglass, which is a microscope, by which the image is magnified. [1913 Webster]

{Achromatic telescope}. See under {Achromatic}.

{Aplanatic telescope}, a telescope having an aplanatic eyepiece.

{Astronomical telescope}, a telescope which has a simple eyepiece so constructed or used as not to reverse the image formed by the object glass, and consequently exhibits objects inverted, which is not a hindrance in astronomical observations.

{Cassegrainian telescope}, a reflecting telescope invented by Cassegrain, which differs from the Gregorian only in having the secondary speculum convex instead of concave, and placed nearer the large speculum. The Cassegrainian represents objects inverted; the Gregorian, in their natural position. The Melbourne telescope (see Illust. under {Reflecting telescope}, below) is a Cassegrainian telescope.

{Dialytic telescope}. See under {Dialytic}.

{Equatorial telescope}. See the Note under {Equatorial}.

{Galilean telescope}, a refracting telescope in which the eyeglass is a concave instead of a convex lens, as in the common opera glass. This was the construction originally adopted by Galileo, the inventor of the instrument. It exhibits the objects erect, that is, in their natural positions.

{Gregorian telescope}, a form of reflecting telescope. See under {Gregorian}.

{Herschelian telescope}, a reflecting telescope of the form invented by Sir William Herschel, in which only one speculum is employed, by means of which an image of the object is formed near one side of the open end of the tube, and to this the eyeglass is applied directly.

{Newtonian telescope}, a form of reflecting telescope. See under {Newtonian}.

{Photographic telescope}, a telescope specially constructed to make photographs of the heavenly bodies.

{Prism telescope}. See {Teinoscope}.

{Reflecting telescope}, a telescope in which the image is formed by a speculum or mirror (or usually by two speculums, a large one at the lower end of the telescope, and the smaller one near the open end) instead of an object glass. See {Gregorian, Cassegrainian, Herschelian, & Newtonian, telescopes}, above.

{Refracting telescope}, a telescope in which the image is formed by refraction through an object glass.

{Telescope carp} (Zo["o]l.), the telescope fish.

{Telescope fish} (Zo["o]l.), a monstrous variety of the goldfish having very protuberant eyes.

{Telescope fly} (Zo["o]l.), any two-winged fly of the genus {Diopsis}, native of Africa and Asia. The telescope flies are remarkable for having the eyes raised on very long stalks.

{Telescope shell} (Zo["o]l.), an elongated gastropod ({Cerithium telescopium}) having numerous flattened whorls.

{Telescope sight} (Firearms), a slender telescope attached to the barrel, having cross wires in the eyepiece and used as a sight.

{Terrestrial telescope}, a telescope whose eyepiece has one or two lenses more than the astronomical, for the purpose of inverting the image, and exhibiting objects erect. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Refracting telescope — Refracting Re*fract ing, a. Serving or tending to refract; as, a refracting medium. [1913 Webster] {Refracting angle of a prism} (Opt.), the angle of a triangular prism included between the two sides through which the refracted beam passes in the …   The Collaborative International Dictionary of English

  • refracting telescope — n. 1. a telescope in which a large biconvex lens causes light rays to converge to a focus, forming an image magnified by a biconvex eyepiece 2. a similar telescope in which the converging rays are intercepted by a biconcave eyepiece: See… …   Universalium

  • refracting telescope — n. 1. a telescope in which a large biconvex lens causes light rays to converge to a focus, forming an image magnified by a biconvex eyepiece 2. a similar telescope in which the converging rays are intercepted by a biconcave eyepiece: See… …   English World dictionary

  • refracting telescope — ► NOUN ▪ a telescope which uses a lens to collect and focus the light …   English terms dictionary

  • Refracting telescope — A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such… …   Wikipedia

  • refracting telescope — noun A telescope which produces a magnified image by refracting light through a series of lenses housed in a tube, with a light gathering objective lens at one end and an eyepiece at the other. Syn: refractor …   Wiktionary

  • refracting telescope — noun optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece • Hypernyms: ↑optical telescope • Hyponyms: ↑field glass, ↑glass, ↑spyglass, ↑Galilean telescope …   Useful english dictionary

  • refracting telescope — /rəˌfræktɪŋ ˈtɛləskoʊp/ (say ruh.frakting teluhskohp) noun a telescope consisting essentially of a lens for forming an image and an eyepiece for viewing it. See telescope (def. 1) …   Australian English dictionary

  • refracting telescope. — See under telescope (def. 1). Also called refractor. [1755 65] * * * …   Universalium

  • refracting telescope — noun a telescope which uses a converging lens to collect the light …   English new terms dictionary

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