Unit of illumination

the light of a sperm candle burning 120 grains per hour. Standard gas, burning at the rate of five cubic feet per hour, must have an illuminating power equal to that of fourteen such candles.
- Rankine.

See also: Unit

References in periodicals archive ?
Footcandle is a unit of illumination defined as the illumination on a surface one square foot in area on which is uniformly distributed a flux of one lumen.