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That which polarizes; especially, the part of a polariscope which receives and polarizes the light. It is usually a reflecting plate, or a plate of some crystal, as tourmaline, or a doubly refracting crystal.

A polyscope, or multiplying glass.

r Range. -- Position micrometer, a micrometer applied to the tube of an astronomical telescope for measuring angles of position in the field of view. -- Single position (Arith.), the method of solving problems, in which the result obtained by operating with an assumed number is to the true result as the number assume…

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.

f the prime vertical. -- Prime-vertical transit instrument, a transit instrument the telescope of which revolves in the plane of the prime vertical, -- used for observing the transit of stars over this circle.

e edge of the moon at the time of a solar eclipse. They may be discovered with the spectroscope on any clear day. Called also solar prominences. See Illust. in Append.

Of, pertaining to, or formed by, a pseudoscope; having its parts appearing with the relief reversed; as, a pseudoscopic image.

Design or tendency; meaning; import; tenor. The whole scope and purport of that dialogue. Norris. With a look so piteous in purport As if he had been loosed out of hell. Shak.

The limit or scope of a statute; the whole extent of its intention or provisions. Marshall. Profanations within the purview of several statutes. Bacon.

Extent or space taken in by anything excursive; compass or extent of excursion; reach; scope; discursive; as, the range of one's voice, or authority. Far as creation's ample range extends. Pope. The range and compass of Hammond's knowledge filled the whole circle of the arts. Bp. Fell. A man has not enough range of tho…

Extent; stretch; expanse; hence, application; influence; result; scope. And on the left hand, hell, With long reach, interposed. Milton. I am to pray you not to strain my speech To grosser issues, nor to larger reach Than to suspicion. Shak.

mirror galvanometer. -- Reflecting goniometer. See under Goniometer. -- Reflecting telescope. See under Telescope.

A reflecting telescope.

through which the refracted beam passes in the decomposition of light. -- Refracting telescope. (Opt.) See under Telescope.

A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.

f a force. -- Resolution of a nebula (Astron.), the exhibition of it to the eye by a telescope of such power as to show it to be composed of small stars.

A system of wires or lines in the focus of a telescope or other instrument; a reticle.

The study of the retina of the eye by means of the ophthalmoscope.

One of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon.

See Solar system, under Solar. Satellite moth (Zoöl.), a handsome European noctuid moth (Scopelosoma satellitia).