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F ISH-EYE LENS

Camera lens covering an extremely wide angle, up to at least 180 , but with considerable barrel distortion and foreshortening of perspective. Also bug eye lens.

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F LASHOVER

An electric discharge over the surface of an insulator.

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F LASHOVER TEST

A test applied to electrical apparatus to determine the voltage at which a flashover occurs between any two parts, or between a part and earth. Also spark over test.

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F LAVESCENT

Becoming yellow; yellowish,

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F LEAKING

Thatching a roof with reeds,

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F LORE PLENO

With double flowers. Abbrev flpi.

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F LUE-GAS TEMPERATURE

Temperature of flue gases at the point in the flue where it leaves the furnace,

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F LUOROPHORE

A group of atoms which give a molecule fluorescent properties,

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F LUSH-BOLT

A sliding bolt sunk into the side or edge of a door so as to be flush with the surface,

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F LY-BY

A type of space mission where the spacecraft passes close to the target but does not rendezvous with it, orbit around it or land on it.

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