A sea which is traveling in the opposite direction to that of the boat

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation. It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polishe ...

A device used by energy auditors to pressurize a building to locate places of air leakage and energy loss.

The lowest price at which a dealer or market maker will sell a.

The interior heat gain due to heat conduction, convection, and radiation from the exterior into the interior, and from occupants and appliances.

A brand of lightweight anchor. It has pivoting flukes that dig into the ground as tension is placed on the anchor.

Conduction of electric current from an underground metallic structure by means of a metallic conductor. Forced drainage is that applied to underground metallic structures by means of an applied electromotive force or sacrificial anode. Natural drainage is ...

Manufacturing Technology Program.

The maximum distance along the runway at which the runway lights are visible to a pilot at touchdown. Runway visual range may be determined by an observer located at the end of the runway, facing in the direction of landing, or by means of a transmissomet ...

The amount of heat energy that may be converted into useful energy from a fuel.

A building structural element that is built onto a building's exterior along the inner edges of all the windows, and extending from the ground to the eaves. Wingwalls help ventilate rooms that have only one exterior wall which leads to poor cross ventilat ...

A region of shallow water usually made of sand or mud, usually running parallel to the shore. Bars are caused by wave and current action, and may not be shown on a chart

The ability of a seaman to foretell weather by the appearance of the sky, change of wind direction, etc. was handed down in the form of proverbs. Some well known are:

Solar and terrestrial radiation directed upward (away From the earth's surface); outgoing radiation.

Towing Safety Advisory Committee

Same as freezing point.

(See MALL.)

The development of slight breaks in a coating that do not penetrate to the underlying surface.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.