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 264
e circuit. Luminous Flux within an Inclosure.—(Rosa, Ref. Cit.) Ifthe inner surface of the hollow sphere has a brightness b and aspecific radiation E —-h, a unit disk at the center of the spherewill receive an illumination E — Tzh. The same will be true wher-ever the unit disk is placed within the… … Fio. 149.—Illumination within an enclosura Tcb. The flux from a point source is thought of as in straight lines,and a disk can be placed normal to the direction of the flux. Butwithin the sphere the flux has a uniform value, but no resultantdirection. Within a cube or inclosure of any shape, of…
Light · Photometry · Electric lighting
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