Foam or spray which is thrown out under the bow of a ship when she is under way. If fast moving with a lot of spray being thrown out, the vessel is said to have "A bone in her teeth".

The portion of a safety/relief valve that surrounds the spring. The spring housing.

The cover of a scuttle-way or small hatchway which leads to to or from a store room, cabin of small craft, crew's quarters, the forecastle or fore peak.

Arrangements with a carrier for the acceptance and carriage of freight; i.e., a space reservation.

Reservation number used to secure equipment and act as a control number prior to completion of a B/L.

The logic of binary systems, such as control systems in which all operations may be reduced to on-off, open-closed, or similar dichotomous basis.

A horizontal pole or spar attached to the mast to which the foot (lower edge) of the sail is fastened

A rest for a cargo-boom when lowered for securing for sea.

A notched support for the boom when the sail is not raised. Unlike a gallows frame, a crutch is stowed when boat is sailing.

A block and tackle attached to the boom and the deck to prevent the main from gybing when sailing downwind

Any system, usually block & tackle or hydraulic, used to hold the boom down. This is useful for maintaining proper sail shape by exerting a downward pull on the boom, particularly when running or on a broad reach.

A stern sprit or spar extending from the stern.

On larger sailing vessels, the space between the foremast and mainmast where spare spars were stored.

A machine which aspirates gas which has already been compressed and delivers the same at higher pressure.

A painted stripe along the waterline delineating the topside from the bottom paint

The anti-corrosive paint used on and above the waterline.

Goods from a captured ship which was permitted to be distributed among the captors at once.

Sudden and rapid flow of tide in certain rivers and estuaries which rolls up in the form of a wave. also known as Eagre.

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.

Shortening of the old term "boatswain," an unlicensed member of the crew who supervises the work of the deck men under direction of the first mate.