A blast of from 4 to 6 seconds' duration.

The speed needed for a boat to begin planing.

Canvas, cloth, leather, tubing, rubber or other material placed around a line or cable to protect it from wear and abrasion

A spring line tied from the boat to chain rode, usually near the water's surface. It helps disperse tension forces. It also prevents damage to the boat by ground tackle and can help in the retrieval of the ground tackle in heavy weather.

The last part of a rope or last link in an anchor chain.

An apparatus consisting of an outside shell and a sheave through which a rope may be passed (pulley).

C The international temperature scale where water freezes at 0 (degrees) and boils at 100 (degrees). Also known as the centigrade scale.

An object made with more than one type of material.

Sails that lie in the direction of the ship's length and whose luffs abut the masts or are attached to stays.

A device that indicates pressure differential above or below atmospheric pressure.

The highest unlicensed rating in the deck department who has immediate charge of all deck hands and who in turn comes under the direct orders of the master or chief mate or mate.

An old naval saying to indicate those young men who, through birth or connection, were able to enter the Royal Navy without examination. Their subsequent promotion was assured.

A bollard with horizontal arms, forming the shape of a cross, as a means of belaying lines.

PSI - Pounds per square inch.

A valve which enables pressure to be reduced, or kept constant at a desired level.

The container of fresh water for drinking purpose used by the crew; formerly it consisted of a cask.

A coating or precipitate deposited on surfaces such as water pipes, steam boilers that are in contact with hard water. Water that contains carbonates or bicarbonates of calcium or magnesium are likely to cause scale when heated.

When U.S. Customs orders shipments without entries to be kept in their custody in a bonded warehouse.

Pair of hooks linked together and attached to a crane.

Center point of all underwater area of the hull where the hull's lateral resistance can be said to be centered.