A ring designed to fit snugly over a compass or compass repeater, and provided with vanes for observing compass bearings. A similar ring provided with means for observing azimuths of the sun is called an AZIMUTH CIRCLE


Related Terms

GARTER SPRING

A closed ring formed of helically wound wire.

Such springs used to secure carbon ring packing segments in a turbogenerator gland.

PALL RING

A specially shaped steel ring used as packing for distillation columns.

PACKING DENSITY

The number of devices or gates per unit area of an integrated circuit. packing ring See piston ring.

O RING

A flat ring made from synthetic rubber, used as an airtight seal or a seal against high pressures.

L-5 TEST

An engine test in a General Motors diesel engine to determine detergency, corrosiveness, ring sticking, and oxidation stability properties of lubricating oils.

LASER GYRO

A gyro in which two laser beams travel in opposite directions over a ringshaped path formed by three or more mirrors; rotation is thus measured without the use of a spinning mass. Also known as ring laser.

HYSTERESIS CLUTCH

A clutch in which torque is produced by attraction between induced poles in a magnetized iron ring and the control field.

RING STICKING

Freezing of a piston ring in its groove in a piston engine or reciprocating compressor due to heavy deposits in the piston ring zone.

GLAND-SEALING STEAM

It is the low-pressure steam that is led to a sealing gland. The steam seals the gland, which may be either a carbon ring or labyrinth type against air at the vacuum end of the shaft.

LIFEBELT

A device such as a buoyant ring or inflatable jacket which keeps a person afloat in the water.

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