A blast of from 4 to 6 seconds' duration.

Heavy canvas used as a covering.

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

The pressure that would be produced by stopping a moving stream of liquid or gas.

The turbulent effect of air on the lee side of a sail when trimmed in too far.

See CFS.

An anchor is said to bite when the flukes dig themselves into the ground and hold firm without dragging.

Is the temperature at which oil begins to flow under prescribed conditions.

A vessel's station bill showing duties of crew.

The senior engineer officer responsible for the satisfactory working and upkeep of the main and auxiliary machinery and boiler plant on board ship.

A filter element whose medium consists of a series of uniform folds and has the geometric form of a cylinder, cone, disc, plate ... Synonymous with "convoluted" and "corrugated".

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 distress call made by a vessel requiring assistance. These three letters were chosen because they were easy to make and read using Morse Code. Some believe the letters meant "Save Our Ship" or "Save Our Souls".

A wooden wedge fitting into a drainage hole in the bottom of a boat for the purpose of draining the boat when she is out of water.

Short lengths of line attached to the sail used to tie the extra sail out of the way when reefing.

Articles packed so that one rests partially or entirely within another, thereby reducing the cubic-foot displacement.

A soft, black, mayonnaise-like deposit which is typically an emulsion of oil, water, and oil insolubles.

The highest navigation bridge. It usually includes an added set of controls above the level of the normal control station for better visibility.

A block with a single sheave which is hinged and opens on the side so that the bight of a line can be led into the block and closed without running the whole length through

Blocks of wood made to fit in the hawse-holes, or holes in the half-ports, when at sea. Those in the hawse-holes are sometimes called hawse-blocks.