An irrevocable letter issued for a specific amount; renews itself for the same amount over a given period.

Thin strips of wood put around the hatches, to keep the tarpaulin down. Also put upon rigging to keep it from chafing. A large batten widened at the end, and put upon rigging, is called a scotchman.

Magnetic variation. The difference, east or west, between magnetic north and true north, measured as an angle. Magnetic variation varies in different geographic locations.

A prisoner sold in the slave market. He was forced to serve in the war galleys, where he pulled on one of the oars.

The sovereign power to take property for a necessary public use, with reasonable compensation.

A sail set forward of the foremast on the headstay; a foresail

The permitted increase in pressure developed after the valve has opened. Usually expressed in percentage, ie.; 3% accumulation (A.S.M.E. Code, Section I). Flows through safety/relief valves are officially determined at these overpressure conditions.

A lower-than-usual tariff rate assessed because a shipper offers a greater volume than specified in the tariff. The incentive rate is assessed for that portion exceeding the normal volume.

The center plank on a wooden deck.

Cargo discharged in excess of the quantity on the manifest.

An apparatus consisting of a small, polished, stainless steel cup placed in a container into which is passed the sample gas. The temperature of the polished surface is lowered by immersing dry ice (solid carbon dioxide) in an acetone solution contained in ...

The relationship of flow per unit area to differential pressure across a filter medium.

A type of clutch which has a spring loaded jaw or detented rolling element to control torque in an assembly tool.

Alphabet used by the Navy when making sure that a letter is understood; i.e. "BRAVO OSCAR ALPHA TANGO spells BOAT"

A filter unit that combines three principles to filter out oil aerosols: 1) Direct interception - A sieving action, 2) Inertial impaction - Collision with filter media fibers, 3) Diffusion -Particles travel in a spiral motion, presenting an effective fron ...

Sailing vessel with three or more masts. Square rigged on foremast, fore and aft rigged on all others.

A raft used in case of emergencies, such as sinking or fire.

A rope attached to the clew of the foresail and rove through a block on the swinging boom. Used for guying the clews out when before the wind.

Small boat carried on the vessel and used in case of emergency.

Used for sending messages to outside companies. Messages are transmitted via Western Union, ITT and RCA. Being replaced by fax and internet.