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dancer, whence the popular name. Called also dancing girls. -- Opera glass, a short telescope with concave eye lenses of low power, usually made double, that is, with a tube and set of glasses for each eye; a lorgnette; -- so called because adapted for use at the opera, theater, etc. -- Opera hat, a gentleman's fold…

Examination of the eye with the ophthalmoscope.

A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.

e mechanical means to determine the accomodative and refractive states of the eye and the scope of its function in general."

The examination of the ear; the art of using the otoscope.

The view obtained by one looking out; scope of vision; prospect; sight; appearance. Applause Which owes to man's short outlook all its charms. Young.

en; as, oxyhydrogen gas. Oxyhydrogen blowpipe. (Chem.) See Blowpipe. -- Oxyhydrogen microscope, a form of microscope arranged so as to use the light produced by burning lime or limestone under a current of oxyhydrogen gas.

hose from very distant objects) images free from aberration. It is used in reflecting telescopes. -- Parabolic spindle, the solid generated by revolving the portion of a parabola cut off by a line drawn at right angles to the axis of the curve, about that line as an axis. -- Parabolic spiral, a spiral curve conceived…

nted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used.

esenting objects in the direction of the diagonal of a cube. -- Perspective glass, a telescope which shows objects in the right position.

An optical glass; a telescope. [Obs.] Crashaw.

one without appreciation of the nobler aspirations and sentiments of humanity; one whose scope is limited to selfish and material interests. [Recent] M. Arnold.

A modified kind of telescope adapted to taking photographs of the sun.

A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.

Of or pertaining to the photoscope or its uses.

Hence, liberty of acting; room for enlargement or display; scope; as, to give full play to mirth. Play actor, an actor of dramas. Prynne. -- Play debt, a gambling debt. Arbuthnot. -- Play pleasure, idle amusement. [Obs.] Bacon. -- A play upon words, the use of a word in such a way as to be capable of double meaning;…

um has very fine striations, and is a favorite object for testing the high powers of microscopes.

es with which the body of a podura is covered. They are used as test objects for the microscope.

Of or pertaining to the polariscope; obtained by the use of a polariscope; as, polariscopic observations.

The art or rocess of making observations with the polariscope.