An ancient instrument formerly used for amplitude observations

Related Terms

AMMETER

An instrument for measuring the magnitude of electric current flow.

HYDROMETER

An instrument for determining either the specific gravity of a liquid or the API gravity.

HUNTING

Fluctuation about a mid-point due to instability, as oscillations of the needle of an instrument about the zero point.

ANEMOMETER

An instrument for measuring the velocity of a fluid.

GAGE

An instrument or device for measuring, indicating or comparing a physical characteristic.

FRETTING

Wear phenomena taking place between two surfaces having oscillatory relative motion of small amplitude.

HACK

A chronometer which has failed to meet the exacting require- ments of a standard chronometer, and is used for timing observations of celestial bodies, regulating ship's clocks, etc. A comparing watch, which may be of high quality, is normally used for timing celestial observations, the watch being compared with the chronometer, preferably both before and after observations. Sometimes called HACK CHRONOMETER.

HYPSOMETER

An instrument for measuring height by determining the boiling temperature of a liquid. Its operation depends on the principle that boiling temperature is dependent on pressure, which normally varies with height.

HORIZONTAL FORCE INSTRUMENT

An instrument used to make a comparison between the intensity of th

HEELING ERROR INSTRUMENT

Heeling adjuster. Also called VERTICAL FORCE INSTRUMENT

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