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Collimation :: 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 :: 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..

Adjust :: 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..

Helioscope :: 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..

Trombone :: Trombone (n.) A powerful brass instrument of the trumpet kind, thought by some to be the ancient sackbut, consisting of a tube in three parts, bent twice upon itself and ending in a bell. The middle part, bent double, slips into the outer parts, as in a telescope, so that by change of the vibrating length any tone within the compass of the instrument (which may be bass or tenor or alto or even, in rare instances, soprano) is commanded. It is the only member of the family of wind instruments whos

Telescope :: 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..

Aperture :: 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..

Reflector :: Reflector (n.) A reflecting telescope.

Power :: Power (n.) The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface..

Perspicil :: Perspicil (n.) An optical glass; a telescope.

Herschelian :: Herschelian (a.) Of or relating to Sir William Herschel; as, the Herschelian telescope..

Erector :: Erector (n.) An attachment to a microscope, telescope, or other optical instrument, for making the image erect instead of inverted..

Dynameter :: 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..

Telescopically :: Telescopically (adv.) In a telescopical manner; by or with the telescope.

Following :: Following (a.) (In the field of a telescope) In the direction from which stars are apparently moving (in consequence of the earth's rotation); as, a small star, north following or south following. In the direction toward which stars appear to move is called preceding..

Telescopical :: 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..

Rille :: Rille (n.) One of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon..

Telescopical :: Telescopical (a.) Of or pertaining to a telescope; performed by a telescope.

Galilean :: Galilean (a.) Of or pertaining to Galileo; as, the Galilean telescope. See Telescope..

Tripod :: Tripod (n.) A three-legged frame or stand, usually jointed at top, for supporting a theodolite, compass, telescope, camera, or other instrument..

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