The first plank on the outer hull of a wooden vessel next to the keel. In steel ships, the plating next to the keel, or what is known as strake A.

A type of instrument shelter. It is a wooden box painted white with double louvered sides and mounted on a stand four feet above the ground.

A compulsory tax on employment and investment income.

See gain.

These lights use an electrically heated filament to produce light in a vacuum or inert gas-filled bulb.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

Cargo moving under Customs control where duty has not yet been paid.

This designates the resistance of a material to heat conduction. The greater the R-value the larger the number.

A pointed device which indicates the amount of resistance encountered when it is forced into a material such as snow or soil. See ram penetrometer.

Sailing close hauled. Sailing toward the wind as much as possible with the wind coming from the bow.

See embrittlement.

Gossip, usually about other people or events. The term scuttlebutt evolved from the name of a keg containing water and alcohol that sailors used to gather about before meals.

The number found by plotting the octave band spectrum on the NR curves given in IS0 Standard R 1996-1967 and selecting the - r- highest noise rating curve to which the spectrum is tangent.

International School for Inspectors of Petroleum

The names of battles or individual ship actions in which a warship has taken part, usually displayed in a prominent place on a ship as a source of pride in her name. Known as Battle Stars in the U.S. Navy.

Measuring point for compressor acceptance test. Pressure at the point of use.

One thousand kilowatts, or 1 million watts; standard measure of electric power plant generating capacity.

Revolutions per Minute

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"