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An instrument for measuring the speed and direction or just speed of a current. The measurements are usually Eulerian since the meter is most often fixed or moored at a specific location.



Related Terms

SLACK WATER

The state of a tidal current when its speed is near zero, especially the moment when a reversing current changes direction and its speed is zero. The term is also applied to the entire period of low speed near the time of turning of the current when it is too weak to be of any practical importance in navigation. The relation of the time of slack water to the tidal phases varies in different localities. For standing tidal waves, slack water occurs near the times of high and low water, while for progressive tidal waves, slack water occurs midway between high and low water.

ALTIMETER

An instrument which determines the altitude of an object with respect to a fixed level, such as sea level; there are two common types: the aneroid altimeter and the radio altimeter.

CUTTING SPEED

The speed of relative motion between the tool and workpiece in the main direction of cutting. Also known as feed rate; peripheral speed.

ELECTRIC TACHOMETER

An instrument for measuring rotational speed by measuring the output voltage of a generator driven by the rotating unit.

I.A.S.

Indicated air speed - the aircraft speed shown on the air speed indicator gauge. IAS corrected for instrument error and atmospheric density is equal to true air speed.

REFRACTION

The change of direction or speed of light as it passes from one medium to another.

ELECTROMAGNETIC WAVES

Waves of associated electric and magnetic fields characterized by variations of the fields. The electric and magnetic fields are at right angles to each other and to the direction of propagation. The waves are propagated at the speed of light and are known as radio (Hertzian) waves, infrared rays, light, ultraviolet rays, X-rays, etc., depending on their frequencies.

IAS

Indicated air speed - the aircraft speed shown on the air speed indicator gauge. IAS corrected for instrument error and atmospheric density is equal to true air speed.

ACCELERATION ERROR

The error resulting from change in velocity (either speed or direction); specifically, deflection of the apparent vertical, as indicated by an artificial horizon, due to acceleration. Also called BUBBLE ACCELERATION ERROR when applied to an instrument using a bubble as an artificial horizon.

ELECTRODYNAMIC INSTRUMENT

An instrument that depends for its operation on the reaction between the current in one or more movable coils and the current in one or more fixed coils. Also known as electrodynamometer.

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