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An instrument invented by Professor Wheatstone, consisting of a reflecting knob at the end of a vibrating rod or thin plate, for making visible, in the motion of a point of light reflected from the knob, the paths or curves corresponding with the musical notes produced by the vibrations.

An instrument invented by Sir David Brewster, which contains loose fragments of colored glass, etc., and reflecting surfaces so arranged that changes of position exhibit its contents in an endless variety of beautiful colors and symmetrical forms. It has been much employed in arts of design. Shifting like the fragments…

A kind of toy or rude musical instrument, as a tube inside of which is a stretched string made to vibrate by singing or humming into the tube.

An instrument for dividing the cornea in operations for cataract.

An instrument by means of which the bolt of a lock is shot or drawn; usually, a removable metal instrument fitted to the mechanism of a particular lock and operated by turning in its place.

Furnished with keys; as, a keyed instrument; also, set to a key, as a tune. Keyed bugle. See Kent bugle.

A primitive Chinese instrument of the cittern kind, with from five to twenty-five silken strings. Riemann.

An instrument for producing curves by the combination of circular movements; -- called also kinescope.

onograph in which sounds appropriate to the scene are automatically uttered by the latter instrument.

A Chinese musical instrument, consisting of resonant stones or metal plates, arranged according to their tones in a frame of wood, and struck with a hammer.

An instrument consisting of a thin blade, usually of steel and having a sharp edge for cutting, fastened to a handle, but of many different forms and names for different uses; as, table knife, drawing knife, putty knife, pallet knife, pocketknife, penknife, chopping knife, etc.

One who, or that which, knocks; specifically, an instrument, or kind of hammer, fastened to a door, to be used in seeking for admittance. Shut, shut the door, good John ! fatigued, knocker; say I'm sick, I'm dead. Pope.

A reed instrument of music of the cornet kind, now obsolete (see Cornet, 1, a.)

(Mus.) A Turkish instrument of music, with a hollow body covered with skin, over which five strings are stretched. [Written also kussir.]

An instrument for measuring, and recording graphically, the pressure of the blood in any of the blood vessels of a living animal; -- called also kymographion.

An instrument for determining the amount of butter fat contained in a given sample of milk.

An instrument for estimating the purity or richness of milk, as a measuring glass, a specific gravity bulb, or other apparatus.

An instrument for estimating the amount of cream contained in milk by ascertaining its relative opacity.

An instrument for drawing the charge of a cannon.

A light-producing vessel, instrument or apparatus; especially, a vessel with a wick used for the combustion of oil or other inflammable liquid, for the purpose of producing artificial light.