Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 272
Fig. 34.—Bristol board. (50 cleg. … 75 90 Fig. 35.—Analysis of Fig. 34. some kind of photometer suitable forcomparing the intensity or candlepowerof two sources of light. It would bedifficult to examine the relation betweenscattered reflexion and the angle ofemission with such a photometer, forat large angles the surface under…
Lighting
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