Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 98
rthan 0.2 meter-candles. * American Jour, of Science, Vol. 44, p. 192, 1892.Troc. Roy. Soc, Vol. 70, p. 313, 1902.^Bull. Bur. Stand., Vol. 5, p. 282, 1908. THE PRINCIPLES OF PHOTOMETRY 83(34) (35) /i = 12.4 log £ + 24.9and for intensities less than this value, /, = 1.56 1ogE + 19.6for meter-candles… … The Rumford photometer. of photometrical devices in use in this country and abroad,together with the prevailing practice concerning their use andmanipulation. A careful study of this portion of the subjecttogether with the preceding part of the chapter should give thereader a good w^orking…
Light · Photometry · Electric lighting
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