Through or across crystals or grains. Also called intracrystalline or transcrystalline.

That stage, on a fixed river gauge, at which overflow of the natural banks of the stream begins to cause damage in any portion of the reach for which the gauge is used as an index.

Diesel.

A platform and protective coaming setting high up on a mast, to accommodate the look-out aloft while the ship is at sea.

Jail

The two times of the year when the sun crosses the equator and night and day are of equal length; usually occurs on March 21st (spring equinox) and September 23 (fall equinox).

A pyrheliometer of the bimetallic type used to measure the intensity of direct solar radiation.

A spring loaded pressure relief valve actuated by the static pressure upstream of the valve. The valve opens normally in proportion to the pressure increase over the opening pressure.

Marine Protection Area

An air operated device for hoisting or pulling. Similar to a slusher or winch

The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates.

See: 'discretionary.

See intergranular corrosion.

An atmometer which uses a filter paper disc as the evaporating element. The amount of water evaporated through the paper is read at the graduated tube reservoir.

Slang expression to indicate that a ship was not fitted with any mechanical aids, and that all the work of the ship had to be done with the strong arms of the crew.

An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point so ...

A device that reduces heat loss at night and during cloudy periods and heat gain during the day in warm weather. A movable insulator could be an insulative shade, shutter panel, or curtain.

Is one in which there is no liquid injection and/or liquid circulation for evaporative cooling or sealing.

Winds which, over a small area, differ from those which would be appropriate to the general pressure distribution.

Forward. The opposite of abaft.