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The gage glass and its fittings for attachment.

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GAGE

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

ELECTRIC TAPE GAGE

A tide gage consisting of a monel metal tape on a metal reel (with supporting frame), voltmeter, and battery. The tape is graduated with numbers increasing toward the unattached end. Tidal height

EXTREME LOW WATER

The lowest elevation reached by the sea as recorded by a tide gage during a given period. The National Ocean Survey routinely documents monthly and yearly extreme low water for its control stations.

EXTREME HIGH WATER

The highest elevation reached by the sea as recorded by a tide gage during a given period. The National Ocean Survey routinely documents monthly and yearly extreme high waters for its control stations.

GAGE PRESSURE

The pressure measured relative to the local atmospheric pressure. Gage pressure may be negative. A negative gage pressure is known as suction or vacuum.

STEAM GAGE

A gage for indicating the pressure of steam.

FLOAT WELL

A vertical pipe or box with a relatively small opening (orifice) in the bottom. It is used as a tide gage installation to dampen the wind waves while freely admitting the tide to actuate a float which, in turn, operates the gage. Also called STILLING WELL.

TIDE STAFF

A tide gage consisting of a vertical graduated staff from which the height of the tide can be read directly.

ALPHA-RAY VACUUM GAGE

An ionization gage in which the ionization is produced by alpha particles emitted by a radioactive source, instead of by electrons emitted from a hot filament; used chiefly for pressures from 10 3 to 10 torrs. Also known as alphatron.

BELL-TYPE MANOMETER

A differential pressure gage in which one pressure input is fed into an inverted cuplike container floating in liquid, and the other pressure input presses down upon the top of the container so that its level in the liquid is the measure of differential pressure.
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