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A small compass mounted in a box for small craft. use



Related Terms

BOX THE COMPASS

To box the compass is to name the thirty-two points of the compass in order.

COMPASS DECLINOMETER

An instrument used for magnetic distribution surveys; employs a thin compass needle 6 inches (15 centimeters) long, supported on a sapphire bearing and steel pivot of high quality; peep sights serve for aligning the compass box on an azimuth mark.

TMC

Transmitting Magnetic Compass

DRY PIPE

A perforated or slotted pipe or box inside the drum and connected to the steam outlet.

LUBBER'S LINE

The vertical line inside a compass case indicating the direction of the ship's head.

BINNACLE

The case in which a ship's compass is kept

COMPASS

Navigational instrument showing the direction of the vessel in relation to the Earth's geographical poles or magnetic poles. Commonly consists of a magnet aligned with the Earth's magnetic field, but other technologies have also been developed, such as the gyrocompass.

CARDINAL

Referring to the four main points of the compass: north, south, east and west.

CORRECTOR

A device to correct the ship's compass, for example counteracting errors due to the magnetic effects of a steel hull.

FATIGUE PLATELETS

Normal particles between 20 and 40 microns found in gear box and rolling element bearing oil samples observed by analytical ferrography. A sudden increase in the size and quantity of these particles indicates excessive wear.

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