A device consisting of a small wheel and a calibrated dial used to measure distances on a map by following the desired route.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

DIELECTRIC STRENGTH

A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)

FILTER ELEMENT

The porous device that performs the actual process of filtration. Also known as Cartridge

COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

COPPER STRIP CORROSION

A qualitative measure of the tendency of a petroleum product to corrode pure copper.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

AIR BREATHER

A device permitting air movement between atmosphere and the component in/ on which it is installed.

SALINITY

A measure of the concentration of dissolved mineral substances in water.

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