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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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.
Temperature of flue gases at the point in the flue where it leaves the furnace,
A sliding bolt sunk into the side or edge of a door so as to be flush with the surface,
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.