A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. Reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption.

Artificial objects to supplement natural landmarks indicating safe and unsafe waters.

This is a factor expressing deviation of a gas from perfect gas laws.

After mast on a schooner or sailing ship carrying a spanker; usually the fourth mast of a five or six masted schooner.

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.

The framework of timber, etc., on which a vessel is built, from which she is launched into the water.

In the days of tall ships the barometer was a glass vessel with a thin stem. The fluid in the glass (in most cases water) would move up and down the stem as the pressure of the surrounding atmosphere changed. These movements were used to predict changes i ...

The power that is consumed to overcome the frictional losses when operating in an unloaded condition.

Slang name for the Q Flag. Also an old term for yellow fever.

A rope net to catch the jib when it is lowered.

(1) To float a vessel off the ways in a building yard after it is completed. (2) A small boat used to ferry people to and from a larger vessel.

Condensation which occurs when a ship sails from a cool to a relatively warm climate.

The behavior of perfect gases, or mixtures thereof, follows a set of laws. Boyle' law, Charle's law, Amonton's law, Dalton's law, Amagat's law, Avogadro's law, Poisson's law.

Cargo which has been booked but does not arrive in time to be loaded before the vessel sails. See also "Windy Booking."

(1) Old nickname for a sailor, who would treat his canvas coats and hats with tar as a protection against the weather. (2) The distilled residue of gum extracted from pine trees, used for preserving many things.

The ability of a boat to keep from being moved sideways by the wind. Keels, daggerboards, centerboards, and leeboards are all used to improve a boat's lateral resistance.

Clauses introduced by charterers based on shortage of delivered cargo because of increased oil prices.

To unfold or unroll a sail. The opposite of furl.

On square-rigged ships, the lines which are lead from the masthead to the ends of the yards to support them.

Pressure dew point temperature (