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 275
10 864 202 4 0 Floor Line Fig. 153.—Desirable distribution of illumination in a room. 80 Apparent Candle-power120 160 200 240 280 320 330 400 … 0° 15 -SO 45 Fig. 154.—Curves for uniform illumination. One-fifth the central intensity should be sufficient for thewalls to illuminate the wall furnishings. Assuming these con-ditions, Mr. Sweet (Ref. Cit.) represented the distribution ofillumination as shown in Fig. 153, and to meet these…
Light · Photometry · Electric lighting
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