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ortion 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.

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

The part of a polariscope which receives the light after polarization, and exhibits its properties.

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

nd it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed.

k preposition. It usually signifies from, away from, off, or asunder, separate; as, in apocope (a cutting off), apostate, apostle (one sent away), apocarpous.

Shortened by apocope; as, an apocopate form.

Shortening by apocope; the state of being apocopated.

Relating to the casting of horoscopes. [Archaic] Whewell.

d remarkable for resemblances to the larvæ of other Tunicata. It is the type of the order Copelata or Larvalia. See Illustration in Appendix.

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

Extent; scope; range; as, a wide area of thought. The largest area of human history and man's common nature. F. Harrison. Dry area. See under Dry.

A genus of copepod Crustacea, parasitic of fishes; a fish louse. See Branchiura.

The horoscope, or that degree of the ecliptic which rises above the horizon at the moment of one's birth; supposed to have a commanding influence on a person's life and fortune.

Examination of the ear by the aid of the auriscope.

(immediate auscultation) applied to parts of the body, as the abdomen; or with the stethoscope (mediate ~), in order to distinguish sounds recognized as a sign of health or of disease.

ght 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 purpose…

Pertaining to, or determined by, the baroscope.

A thermal cymoscope which operates by increased resistance when subjected to the influence of electric waves. The original form consisted of an extremely fine platinum wire loop attached to terminals and inclosed in a small glass or silver bulb. In a later variety, called the liquid barretter, wire is replace by a colu…

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.