Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 212
ry.—The unit used in comparing the light-in-tensities is called one candle-power, written c. p. Candle-power is measured by determining the distances at whichthe source of light to be tested, and a standard candlespecified by law, give lights of equal intensity. For ex-ample, if the light to be… … Fig. 101. in Fig. 101, and is called the Rwnforcl Photometer. Twometer-sticks MM carry two blocks LL, one of whichsupports the standard reference-candle, the other the lightto be measured, represented here by two candles. These 200 LIGHT. blocks can be moved to any position on the meter-sticks.A…
Physics
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