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A rain gauge.

A thermometer by merely inverting which the temperature may be registered. The column of mercury is broken and, as it remains until the instrument is reset, the reading may be made at leisure.

An apparatus for the determination of the amount of urea in urine, in which the nitrogen evolved by the action of certain reagents, on a given volume of urine, is collected and measured, and the urea calculated accordingly.

A small hydrometer for determining the specific gravity of urine.

An instrument for the comparison of barometers.

or the tension of any vapor; specifically, an instrument of this sort used as an alcoholometer in testing spirituous liquors.

An instrument for comparing magnetic forces, esp. in the earth's magnetic field.

An apparatus for measuring speed, as of machinery or vessels, but especially of projectiles.

An odometer; -- called also viatometer.

A viameter.

An instrument for determining the strength or purity of wine by measuring its density.

An instrument for measuring the degree of viscosity of liquids, as solutions of gum.

An instrument for the exact measurement of electric currents.

An instrument for measuring the voltaic electricity passing through it, by its effect in decomposing water or some other chemical compound acting as an electrolyte.

A wattmeter.

An instrument for measuring in volts the differences of potential between different points of an electrical circuit.

An instrument for measuring the volume of a body, especially a solid, by means of the difference in tension caused by its presence and absence in a confined portion of air.

An instrument for measuring the volumes of gases or liquids by introducing them into a vessel of known capacity.

A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height.

A contrivance for measuring a supply of water delivered or received for any purpose, as from a street main.