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Huyghenian :: Huyghenian (a.) Pertaining to, or invented by, Christian Huyghens, a Dutch astronomer of the seventeenth century; as, the Huyghenian telescope..

Diaphragm :: Diaphragm (n.) A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope..

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

Speculum :: Speculum (n.) A reflector of polished metal, especially one used in reflecting telescopes. See Speculum metal, below..

Alidade :: Alidade (n.) The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument.

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..

Diskless :: Diskless (a.) Having no disk; appearing as a point and not expanded into a disk, as the image of a faint star in a telescope..

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

Sweep :: Sweep (v. i.) To pass over, or traverse, with the eye or with an instrument of observation; as, to sweep the heavens with a 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..

Telemeter :: 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..

Equatorial :: 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 clockw

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..

Collimate :: Collimate (v. t.) To render parallel to a certain line or direction; to bring into the same line, as the axes of telescopes, etc.; to render parallel, as rays of light..

Eyepiece :: 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..

Telescoped :: Telescoped (imp. & p. p.) of Telescop.

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..

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

Definition :: Definition (n.) The act of defining; determination of the limits; as, a telescope accurate in definition..

Collimator :: Collimator (n.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal..

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