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A spring designed so that its torque cancels that of the instrument of which it is a part, for all deflections of the pointer.

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.

BROOKFIELD VISCOSITY

Apparent viscosity in cP determined by Brookfield viscometer, which measures the torque required to rotate a spindle at constant speed in oil of a given temperature. Basis for ASTM Method D 2983; used for measuring low temperature viscosity of lubricants.

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

HYSTERESIS ERROR

That error in the reading of an instrument due to hysteresis
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