Circular metallic elements that ride in the grooves of a piston and provide compression sealing during combustion. Also used to spread oil for lubrication.

The swell of a ship's hull around the propeller shaft.

(1) A false keel. (2) The projection of the keel abaft the stern frame where the spindle of the rudder rests.

The aft edge of a sail, more commonly called the leech.

A bolted rim used for attachment to another object.

Is the total gas pressure (static plus velocity) at the discharge port of the compressor. Velocity pressure is considered only with dynamic compressors.

To place pieces of dunnage in between pieces of cargo in order to prevent shifting of the cargo.

Bread that was supplied to ships before bakeries were introduced on board.

A private ship operating under license from a government against the merchant shipping of an enemy.

Steps in the compression of a gas, In reciprocating compressors, each stage usually requires a separate cylinder, in dynamic compressors, each requires a separate rotor disc.

Thin plates attached to the exterior of the hull to deaden any rolling.

A reference book named after the original author, Nathaniel Bowditch. Updated versions contain tables and other information useful for navigation.

A large reinforced eye in the leech and clew of a sail that allows a line to fasten to it; e.g., the reef cringle and clew cringle.

A form requiring all data in a commercial invoice along with a certificate of value and/or a certificate of origin. Required in a few countries (usually former British territories) and usually serves as a seller's commercial invoice.

A bullying and tyrannical officer; he would drive his crew by brutality and the power of his fists.

Sailing too close to the wind

A small projection of land.

The difference between the discharge pressure and the intake pressure.

A loss discovered before or at the time of delivery of a shipment.

Compressor controls will run the compressor at varying loads to accommodate demand variations. Running a compressor at less than full load results in a drop in compressor efficiency and thus an increase in operating costs.