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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Candle
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1992-09-03
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713b
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18 lines
Vertical cylinder of wax (such as tallow or
paraffin wax) with a central wick of string.
A flame applied to the end of the wick melts
the wax, thereby producing a luminous flame.
The wick is treated with a substance such as
alum so that it carbonizes but does not
rapidly burn out. Candles and oil lamps were
an early form of artificial lighting.
Accurately made candles - which burned at a
steady rate - were calibrated along their
lengths and used as a type of clock. The
candle was also the name of a unit of
luminous intensity, replaced in 1940 by the
candela (cd), equal to 1/60 of the luminance
of 1 sq cm of a black body radiator at a
temperature of 2,042K (the temperature of
solidification of platinum).