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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. [Recent]

An adjustable traveling bag consisting of two cases, the larger slipping over the other.

A telescope adapted for taking photographs of the heavenly bodies.

A telescope devised for looking into a body of water.

rges from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.

ue relative position, as the parts of an instrument; to regulate for use; as, to adjust a telescope or microscope.

The operation of bringing all the parts of an instrument, as a microscope or telescope, into their proper relative position for use; the condition of being thus adjusted; as, to get a good adjustment; to be in or out of adjustment.

s and to acts; as, an adroit mechanic, an adroit reply. "Adroit in the application of the telescope and quadrant." Horsley. "He was adroit in intrigue." Macaulay.

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 Whewell.

To render larger, more extended, or more intense, and the like; -- used especially of telescopes, microscopes, etc.

The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

To come near to; to approach. The telescope approximates perfection. J. Morse.

straight line passing through its center and perpendicular to its surfaces. -- Axis of a telescope or microscope, the straight line with which coincide the axes of the several lenses which compose it. -- Axes of coördinates in a plane, to straight lines intersecting each other, to which points are referred for the pu…

A dioptric telescope, fitted with two tubes joining, so as to enable a person to view an object with both eyes at once; a double- barreled field glass or an opera glass.

Adapted to the use of both eyes; as, a binocular microscope or telescope. Brewster.

A concave tool used in grinding lenses or the speculums of telescopes. Knight.

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. [Written also kathetometer.]

A reflecting telescope, part of which is made to rotate eccentrically, so as to produce a ringlike image of a star, instead of a point; -- used in studying the scintillation of the stars.

nder 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.

he 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. Error of collimation, the deviation of the line collimation of an astronomical instrument from the position it ought to have with…