Hydrometer

Hy*drom"e*ter

(?), n. [Hydro-, 1 + -meter: cf. F. hydromtre.] 1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.
[1913 Webster]

It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities.
[1913 Webster]

2. An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

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Hy`dro*met"ric

(?),

Hy`dro*met"ric*al

(?), } a. [Cf. F. hydromtrique.] 1. Of or pertaining to an hydrometer, or to the determination of the specific gravity of fluids.
[1913 Webster]

2. Of or pertaining to measurement of the velocity, discharge, etc., of running water.
[1913 Webster]

3. Made by means of an hydrometer; as, hydrometric observations.
[1913 Webster]

Hydrometric pendulum, a species of hydrometer consisting of a hollow ball of ivory or metal suspended by a treated from the center of a graduated quadrant, and held in a stream to measure the velocity of the water by the inclination given to the thread; a kind of current gauge.
[1913 Webster]

 

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Fri 14th December 2018