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 262
is equal to the num])er oflines of force due to unit current in S^ passing through ^Sj. Itfollows from the above that in any closed surface of uniformbrightness the flux passing out from any portion S^ is equal tothat received from the remainder of the surface S^- A Hollow Sphere.^—(Rosa, Ref.… … Fig. 148.—The hollow sphere.The flux falling on *Sj due to S is c //? _eSSiCos^<p mE SSj cos^ o But r =2a cos ^ r^ = 4a^ cos^ cp COS^ (p_ 1 ^ See Liebenthal, Praktische Photometric, p. 301. (170) (171) 248 LIGHT, PHOTOMETRY AND ILLUMINATION and this is the same for every element of the sphere.…
Light · Photometry · Electric lighting
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