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A machine for measuring at any moment velocity of rotation, as of a wheel of a steam engine. Knight.

olytic cell, or on the electric condition of a vacuum has been applied in the various cymoscopes.

A modification of the kaleidoscope; -- used to reflect images so as to form beautiful designs.

A dark box constructed for viewing transparent pictures, with or without a lens.

Same as Dichroscope.

An instrument for examining the dichroism of crystals.

An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is…

An instrument for observing the boiling point of liquids, especially for determining the alcoholic strength of a mixture by the temperature at which it boils.

An instrument for intensifying sounds produced by percussion of the thorax. Knight.

pecies of electricity present, as by means of pith balls, and the like. Condensing electroscope (Physics), a form of electroscope in which an increase of sensibility is obtained by the use of a condenser.

An instrument for examining the interior of the rectum, the urethra, and the bladder.

A kind of reflecting microscope. [Obs.]

A kind of firearm; a carbine.

An instrument for observing or exhibiting fluorescence.

An instrument or apparatus for detecting the presence of electrical currents, especially such as are of feeble intensity.

An apparatus for detecting the presence of any dangerous gas, from a gas leak in a coal mine or a dwelling house.

An instrument for viewing or examining the interior of the stomach.

See Graphoscope.

An optical instrument for magnifying engravings, photographs, etc., usually having one large lens and two smaller ones.

s, etc. It was devised by Professor W. R. Johnson, in 1832, by whom it was called the rotascope.