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An instrument for exhibiting the transverse vibrations of cords, and ascertaining the relations between musical notes. It consists of a cord stretched by weight along a box, and divided into different lengths at pleasure by a bridge, the place of which is determined by a scale on the face of the box.…

A combination of spectroscope and bolometer for determining the distribution of energy in a spectrum. --Spec`tro*bo`lo*met"ric (#), a.

A spectroscope fitted for measurements of the luminious spectra observed with it.

An instrument for measuring or comparing the intensites of the colors of the spectrum.

An instrument for measuring the curvature of spherical surface, as of lenses for telescope, etc.

See Sphygmometer.

An instrument for measuring the strength of the pulse beat; a sphygmograph.

which can be expelled from the chest after the deepest possible inspiration. Cf. Pneumatometer.

An electric dynamometer having two coils so arranged that one carries the primary current, and the other the secondary current, of a transformer.

A horizontal graduated bar mounted on a staff, used as a stadium, or telemeter, for measuring distances.

A drop measurer; a glass tube tapering to a small orifice at the point, and having a bulb in the middle, used for finding the number of drops in equal quantities of different liquids. See Pipette. Sir D. Brewster.

rument for measuring the solid contents of a body, or the capacity of a vessel; a volumenometer.

l movements of a given point of the chest wall, during respiration; -- also called thoracometer.

An instrument for measuring the amount of strabismus.

An instrument for measuring columns.

A sensitive kind of barometer, in which the pressure of the atmosphere, acting upon a liquid, as oil, in the lower portion of the instrument, compresses an elastic gas in the upper part.

An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance. Specifically: --

A speed indicator; a tachometer.

An instrument for indicating the level of water in a distant tank or reservior.

sed for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known.