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

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.

Is the ratio of the computed isentropic temperature rise to the measured total temperature rise during compression.

When the water has large or breaking waves in stormy conditions.

The operation of taking a sounding with the hand lead (to find bottom).

To windward, in the direction of the eye of the wind; toward the wind; in the direction from which the wind is coming

Rolling a vessel, that is slightly ice-bound, so as to break the surface ice around her. May sometimes be done when a vessel is lightly aground, but not ice-bound.

The increase in pressure in the discharge header that develops as a result of flow after the pressure relief device opens

A tiller or a wheel generally installed on the bridge or wheelhouse of a ship to turn the rudder during manoeuvering and navigation. It is in fact the steering wheel of the ship.

An absolute temperature scale. (

The air compressor continues to run, usually at full RPM, but no air is delivered because the inlet is either closed off or modified, not allowing inlet air to be trapped.

A salt or ester of carbonic acid.

A fabric, usually synthetic, used to make sails.

Those frames of a ship's hull which are equal in area, one forward and one aft of the ship's center of gravity.

A line led to a sail, but is not currently in use. The line currently in use is known as the working sheet. Usually the working and lazy sheets change when the boat is tacked.

Gross tonnage is the basis on which manning rules and safety regulations are applied, and registration fees are reckoned. Port fees are also often reckoned on the basis of GT and NT. GT and NT are defined according to formulas which take account, among ot ...

A watch tackle (small, handy block and tackle for general use).

To leave a ship without authority (deserting).

A machine employing two or more stages.

A warning from aloft (heads up).