A heating system where heat is supplied (radiated) into a room by means of heated surfaces, such as electric resistance elements, hot water (hydronic) radiators, etc.

Category:Energy Terms

An instrument which determines the black-body temperature of a substance by measuring its thermal radiation.

Category:Meteorology

The transfer of heat through matter or space by means of electromagnetic waves.

Category:Energy Terms

Emission or transfer of energy in the form of electromagnetic waves or particles.

Category:Meteorology

Fog over land caused by condensation of vapor in the air above cooler ground.

Category:Sea Words

A diagram showing the intensity of the radiation field in all directions from a transmitting radio or radar antenna at a given distance from the antenna.

Category:Meteorology

A device used on certain types of instruments to prevent unwanted radiation from affecting the measurement of a quantity. Also called solar radiation shield.

Category:Meteorology

The process of cooling by which a heat absorbing media absorbs heat from one source and radiates the heat away.

Category:Energy Terms

A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.

Category:Energy Terms

Any source of radiant energy, especially electromagnetic energy.

Category:Meteorology

A device that releases pressure within a radiator when the pressure inside exceeds the operating limits of the vent.

Category:Energy Terms

An instrument that uses radio waves to communicate with other vessels. VHF very high frequency - radios are common for marine use, but are limited in range. Single Side Band SSB - radios have longer ranges.

Category:Sea Words

An instrument designed to measure the effect of sunlight on evaporation from plant foliage. It consists of a porous clay atmometer whose surface has been blackened so that it absorbs radiant energy.

Category:Meteorology

A navigational aid that emits radio waves for navigational purposes. The radio beacon's position is known and the direction of the radio beacon can be determined by using a radio direction finder.

Category:Sea Words

A navigational instrument which provides a bearing to a radio beacon.

Category:Sea Words

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves. T ...

Category:Meteorology

Maintains and monitors radio, sends and receives messages. Often maintains electronic navigation. Latest replaced with certified GO (Deck officer)

Category:Sea Words

An officer who operates and controls the shipboard communication equipment.

Category:Sea Words

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves.

Category:Meteorology

A device which automatically records the water equivalent of snow on a given surface as a function of time. A small sample of a radioactive salt is placed in the ground in a shielded collimator which directs a beam of radioactive particles upwards. A Geig ...

Category:Meteorology