A measure of the flow of current (in amperes) over one hour.

Occurs in the base metal adjacent to weldments due to high through-thickness strains introduced by weld metal shrinkage in highly restrained joints. Tearing occurs by decohesion and linking along the working direction of the base metal; cracks usually run ...

PFD Manufacturers Association

A captive balloon used to maintain meteorological equipment aloft at approximately a constant height. The kytoon is streamlined and combines the aerodynamic properties of a balloon and a kite.

Continuous longitudinals fastened under the deck.

A type of heat pump that transfers heat in outdoor air to water for space or water heating.

The positive pole or electrode of an electrolytic cell, vacuum tube, etc. (see also sacrificial anode).

A wall usually about 3 to 4 feet high located that is placed in the attic of a home, anchored with plates between the attic floor joists and the roof joist. Sheathing can be attached to these walls to enclose an attic space.

Portable Electronic Thermometer

An old name for high waves when they break with a white crest.

Allows equipment and supplies arriving at one port to be loaded on a vessel, aircraft, etc., for its exclusive use and to be exported from the same port.

The largest of the headsails; corresponds to the genoa.

The total gas pressure (static plus velocity).

Guaranteed Safe Berth

The limiting values of ceiling, visibility, and wind, or runway visual range, established as safety minimum for aircraft landings and take-offs.

The ratio of the average load on (or power output of) a generating unit or system to the capacity rating of the unit or system over a specified period of time.

Satellite Navigation

Term for disabled vessel that had to fall out of a convoy and thus became easy prey for submarines.

A sea on the quarter (coming from a side of the stern).

The presence of contaminants in the air in concentrations that prevent the normal dispersive ability of the air, and that interfere with biological processes and human economics.