Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 550
his is placed a light of a certain intensity, which serves as astandard ; in London it is a sperm candle f of an inch in diameter, andburning 120 grains in an hour. The light to be tested—a petroleum lamp,or a gas burner consuming a certain volume of gas in a given time—is thenmoved in a right line… … by means of the scale, their relative illuminating powers are respectively asthe squares of their distances from the screen. The difficulty of constructing candles capable of giving a light sufficientlyuniform for standard purposes has led Harcourt to adopt as unit thelight formed by burning a…
Physics
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