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

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

Intimate mixture of oil and water, generally of a milky or cloudy appearance. Emulsions may be of two types: oil-in water (where water is the continuous phase) and water-in-oil (where water is the discontinuous phase).

A machine employing two or more stages.

(1) A body of salt water. A very large body of fresh water. (2) The condition of the water around a boat. Heavy seas for example.

A container frame fitted to accommodate two or more separate tanks for liquids.

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.

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

The International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978.

To go aboard the vessel; to put onboard a vessel.

Said of a vessel when stopped and lying near the wind in heavy weather. See Heave To

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

Six feet. Comes from the Dutch word "fadom" which was the distance between fingertips of outstretched hands.A unit of measurement relating to the depth of water or to the length of line or cable; one fathom is 6 feet or 1.83 meters

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.

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.

An absolute temperature scale. (

CFM flowing through the compressor inlet filter or inlet valve under rated conditions

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.

U.S. Customs' automated program under AMS. It allows for electronic reporting of inbound (foreign) cargoes in the U.S.

A sighting taken for celestial navigation at noon, when the sun is at its highest point in the sky.