Amount of unused space in a ship or a hold by virtue of the irregular shape of the cargo.

An automatic or manual device designed to control pressure, flow or temperature.

A can buoy. A cylindrical buoy painted green and having an odd number used in the United States as a navigational aid. At night they may have a green light. Green buoys should be kept on the left side when returning from a larger body of water to a smalle ...

A sound signal device (not necessarily mechanically operated).

The black line parallel with ship's keel marked on the inner surface of the bowl of a compass, indicating the compass direction of the ship's head.

The use of a sound barrier separating the sound from the receiver.

An attachment point for another object.

A label required on shipments of flammable articles.

Pieces of plank bolted to the outer end of the bowsprit, to reeve the foretopmast stays through.

The horsepower required to compress adiabatically the air or gas delivered by the compressor through the specified range of pressures.

Usually refers to a rating that applies to an article regardless of size or quantity.

Screen of cloth or other material to give the crew protection against the weather, wind and water spray.

Forward. The opposite of abaft.

Air cylinder

A form of steam engine where a piston moves back and forth inside a cylinder, transmitting its motion to a driving shaft by a connecting rod and crank.

A formula of the specific factors or elements that control the making of a rate. A rate can be based on any number of factors (i.e., weight, measure, equipment type, package, box, etc.).

A horseshoe-shaped or circular reef of coral surrounding a lagoon.

Any point of sail with the wind coming from the side of the boat. If the wind is coming from directly over the side, it is a beam reach. If the wind is coming from forward of abeam it is a close reach. If the wind is coming from over the quarter, it is ca ...

To reach the end; to bring one object hard up against another, as when two blocks in a block and tackle arrangement are brought together.

Money paid by shipper to Master of ship for diligence in care of cargo. Not now paid to Master, but added to freight. Amount was usually about 1% of freight.