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telescope
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- Telescope - n. - An optical instrument used in viewing distant objects, as the heavenly bodies.
- Telescope - a. - To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another.
- Telescope - v. t. - To cause to come into collision, so as to telescope.
- Telescoped - imp. & p. p. - of Telescope
- Goldfish - n. - A small domesticated cyprinoid fish (Carassius auratus); -- so named from its color. It is native of China, and is said to have been introduced into Europe in 1691. It is often kept as an ornament, in small ponds or glass globes. Many varieties are known. Called also golden fish, and golden carp. See Telescope fish, under Telescope.
- Telemeter - n. - An instrument used for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known.
- Helioscope - n. - A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light.
- Micrometer - n. - An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.
- Collimation - n. - The act of collimating; the adjustment of the line of the sights, as the axial line of the telescope of an instrument, into its proper position relative to the other parts of the instrument.
- Image - n. - The figure or picture of any object formed at the focus of a lens or mirror, by rays of light from the several points of the object symmetrically refracted or reflected to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror.
- Eyepiece - n. - The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.
- Spyglass - n. - A small telescope for viewing distant terrestrial objects.
- Y - n. - One of the forked holders for supporting the telescope of a leveling instrument, or the axis of a theodolite; a wye.
- Dynameter - n. - An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power.
- Cathetometer - n. - An instrument for the accurate measurement of small differences of height; esp. of the differences in the height of the upper surfaces of two columns of mercury or other fluid, or of the same column at different times. It consists of a telescopic leveling apparatus (d), which slides up or down a perpendicular metallic standard very finely graduated (bb). The telescope is raised or depressed in order to sight the objects or surfaces, and the differences in vertical height are thus shown on the graduated standard.
- Ghost - n. - A false image formed in a telescope by reflection from the surfaces of one or more lenses.
- Equatorial - n. - An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. Called also an equatorial telescope.
- Level - a. - Coinciding or parallel with the plane of the horizon; horizontal; as, the telescope is now level.
- Telescopical - a. - Having the power of extension by joints sliding one within another, like the tube of a small telescope or a spyglass; especially (Mach.), constructed of concentric tubes, either stationary, as in the telescopic boiler, or movable, as in the telescopic chimney of a war vessel, which may be put out of sight by being lowered endwise.
- Telescope - a. - To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another.
- Comet- seeker - n. - A telescope of low power, having a large field of view, used for finding comets.
- Finder - n. - One who, or that which, finds; specifically (Astron.), a small telescope of low power and large field of view, attached to a larger telescope, for the purpose of finding an object more readily.
- Collimator - n. - A telescope arranged and used to determine errors of collimation, both vertical and horizontal.
- Optigraph - a. - A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.
- Adjust - v. t. - To bring to a true relative position, as the parts of an instrument; to regulate for use; as, to adjust a telescope or microscope.
- Aperture - n. - The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
- Telespectroscope - n. - A spectroscope arranged to be attached to a telescope for observation of distant objects, as the sun or stars.
- Ocular - n. - The eyepiece of an optical instrument, as of a telescope or microscope.
- Definition - n. - The act of defining; determination of the limits; as, a telescope accurate in definition.