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 161
r, if these curves represented the distribution of lightfrom luminous sources in a vertical plane the mean sphericalcandle-power or the total flux of light would he the same for each. The fundamental theory of this section of the subject is basedon the study of spherical surfaces, in junction with…
Light · Photometry · Electric lighting
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