A Dictionary of Arts, Manufactures and Mines...
London: Longman, Orme, Brown, Green & Longmans, 1839.
A few years ago I made a set of experiments upon the relative intensities of light, and duration of different candles, the results of which are contained in the following table.
|Number in a pound.||Duration of a candle.||Weight in grains.||Consumption
|Proportion of light.||Economy of light.||Candles equal one Argand.|
|6 ditto||7||2½||1160||163||14 2/3||66||5.0|
|Argand oil flame||—||512||69.4||100|
A Scotch mutchkin, or ½ of a gallon of good seal oil, weighs 6010 gr., or 13 1/10 oz., avoirdupois, and lasts in a bright Argand lamp 11 hours 44 minutes. The weight of oil it consumes per hour is equal to 4 times the weight of tallow [consumed in a hour] in candles 8 to the pound, and 1/7 [sic, a "3" is missing, should be "3 1/7"] the weight of tallow in candles 6 to the pound. But, its light being equal to that of 5 of the latter candles, it appears from the above table that 2 pounds weight of oil, value 9d. in an Argand, are equivalent in illuminating power to 3 pounds of tallow candles, which cost about two shillings. The larger the flame in the above candles the greater the economy of light.
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Last revised: 1 January 2011.