Word: four-watt
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Dates: during 1943-1943
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...unit consists of plastic envelopes of assorted sizes and a lightweight portable black light lamp which can be placed on the navigator's table or worn like a miner's lamp. The envelopes are made of orange-red fluorescent-treated transparent plastic. The lamp may be the four-watt, 24-28-volt black light already standard with both the Army & Navy. When the lamp is held five inches above an envelope, the latter's fluorescent surface steps up the short ultraviolet waves enough to make them visible, not enough to destroy eye adaptation. The illumination, unlike that...
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