A conductor or system of conductors for radiating and/or receiving radio energy. Also called aerial.

See feed.

See gain.

Same as radiation pattern. Anticyclone-An area of high atmospheric pressure which has a closed circulation that is anticyclonic (clockwise in northern hemisphere and counterclockwise in southern hemisphere).

Antwerp-Hamburg Range

A hard, dense type of coal, that is hard to break, clean to handle, difficult to ignite, and that burns with an intense flame and with the virtual absence of smoke because it contains a high percentage of fixed carbon and a low percentage of volatile matt ...

Referring to alterations in the environment due to the presence or activities of humans.

The outer layer on a coalescing filter that prevents separated liquids from re-entering the air stream. Also known as anti re-entrainment barrier.

A tariff imposed to discourage sale of foreign goods, subsidized to sell at low prices detrimental to local manufacturers.

Intended to prevent fouling of under-water structures, such as the bottoms of ships; refers to the prevention of marine organism's attachment or growth on a submerged metal surface, generally through chemical toxicity caused by the composition of the meta ...

A pair of additional backstays temporarily rigged to provide extra support to the masts of square rigged vessels when sailing downwind.

Sometimes called a pulsation damper this is a small receiver fitted on the inlet or discharge of a reciprocating compressor. The device is designed to remove the resonance from the compressor thereby reducing noise.

Area of high barometric pressure where the wind circulates clockwise in the Northern Hemisphere, and counter-clockwise in the Southern Hemisphere. These are fair weather systems with light or moderate winds.

A paint applied to the boat's bottom below the waterline which contains "poisons", such as copper, to inhibit the growth of marine life such as weeds or barnacles.

A fluid, such as methanol or ethylene glycol, added to vehicle engine coolant, or used in solar heating system heat transfer fluids, to protect the systems from freezing.

An addition agent for electroplating solutions to prevent the formation of pits or large pores in the electrodeposit.

A thin coating of a material applied to a photovoltaic cell surface that reduces the light reflection and increases light transmission.

In Jeffreys' classification, a wind for which the pressure force exactly balances the viscous force, in which the vertical transfers of momentum predominate.

US legislation to prevent monopolies and restraint of.

Usually refers to a rating that applies to an article regardless of size or quantity.