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A tractor that propels itself on two endless tracks revolving around wheels.

Related Terms

ABYSSAL GAP

A narrow break in a sea floor rise or between two abyssal plains.

ASHCROFT SYSTEM

Timber boat building technique using two layers of overlapping diagonal strip planks with glue barrier between. High strength and low weight.

ALL FOURS MOORING

Anchoring a vessel with two chain cables ahead and two chain cables astern.

ANCHORS IN TANDEM

Use of two anchors in a line to improve holding power.

BELLS

Struck every half hour after each change of watch of four hours. 8 bells at change of watch, followed by 1 bell at half hour after change, 2 bells at + one hour, 3 bells at + one and a half hours, 4 bells at + two hours, etc.

BOWLINE IN A BIGHT

A knot tied in the middle of a line to form two loops that can be used as a temporary harness.

BLOCKING DIODE

A electrical valve that permits charging of two batteries from one charger without paralleling the batteries.

BULLDOG CLIP

A threaded u bolt that will tenaciously grip two steel wire ropes due to its shaped clamping saddle tightening around the wires. To temporarily replace an eye splice, four clips should be used separated by a distance of 8 times the diameter of the wire.

CLEW LINES

The two brails that lead to the clews of a square sail.

CAVAL

A two armed metal deck fitting around which a vessel's lines are made fast.
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