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iewed through a large lens with stereoptical effects. It is often combined with the stereoscope.

A modification of the magic lantern, used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used.

An instrument containing a combination of colored glasses such that they transmit only red light, so that objects of other colors, as green leaves, appear black when seen through it. It is used for viewing colored flames, to detect the presence of potassium, lithium, etc., by the red light which they emit.…

An astrolabe; a planisphere. [Obs.]

A modification of the stethoscope, for directly auscultating the uterus from the vagina.

arged image of an object which is too minute to be viewed by the naked eye. Compound microscope, an instrument consisting of a combination of lenses such that the image formed by the lens or set of lenses nearest the object (called the objective) is magnified by another lens called the ocular or eyepiece. -- Oxyhydrog…

A spectroscope arranged for attachment to a microscope, for observation of the spectrum of light from minute portions of any substance.

See Projector, below.

A simple form of moving-picture machine in which the series of views, exhibiting the successive phases of a scene, are printed on paper and mounted around the periphery of a wheel. The rotation of the wheel brings them rapidly into sight, one after another, and the blended effect gives a semblance of motion.…

A form of kaleidoscope.

An instrument for observing the clouds and their velocity.

A Nilometer.

An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the…

An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens. -- Oph*thal`mo*scop"ic, a.

An instrument designed to show the condition of the superficial portions of the eye.

An instrument for showing visually the changes in a varying current; an oscillograph.

An instrument for exhibiting the repulsive action produced by light or heat in an exhausted vessel; a modification of the radoimeter. W. Crookes.

An instrument for examining the condition of the ear.

Of or pertaining to the otoscope or to otoscopy.

An apparatus employed to indicate the presence, or the amount, of ozone.