A U.S. Customs program wherein at least two designated Customs ports will enter cargo that arrives at either port without the necessity of an in-bound document.

A longitudinal stiffener for the side of a ship, made of angle bar, bulb angle channel or plates, etc. Depending upon their locations, stringers are known as bilge stringers, side stringers, hole stringers, etc.

Capable of going to sea.

Area into which a boat can not go without tacking.

Ability of a filter to remove particle matter from an air stream. Measured by comparing concentrate of material upstream and downstream of the filter. Typical particulate sizes range from .3 micron to 50 micron.

Is the ratio of the thermodynamic work requirement in the cylinder to actual brake horsepower requirement.

The art and science of designing vessels.

U.S. Commerce Department document, "Shipper's Export Declaration."

To make life onboard for the crew as uncomfortable as possible, by keeping them at work at all hours, often unnecessarily.

Usually refers to intracity hauling on drays or trucks.

Relay to all others in order (a signal repeated from one ship to the next astern in column).

A frame used to support the boom when the sail is down.

A device consisting of a heat transfer system, a moisture elimination system and a refrigeration system designed to improve the quality of the air and reduce the temperature of the air.

The area (in sq inches) of the filter element that is exposed to the flow of air or fluid for effective filtering.

An angle piece fitted over the edge of boxes, crates, bundles and other packages to prevent the pressure from metal bands or other types from cutting into the package.

A traditionally shaped anchor having flukes perpendicular to the stock of the anchor and connected by a shank. These are less common than modern anchors such as the plow and lightweight anchors.

Man or boy employed in sailing deep-water craft. Word is sometimes loosely used to include men who go to sea. Used officially to denote a seaman serving on deck.

A curved inlet section on an impeller.

A safe anchorage, protected from most storms; may be natural or man-made, with breakwaters and jetties; a place for docking and loading.

An angle or channel from deck beam to shell frame taking the place of a bracket.