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 26
0 15° 30 a Fig. 3.—Pulp tint, white. … 0 15 30° 45 Fig. 4.—Silk fibre, orange-yellow. The efficiencies of different papers and with different incidentangles are given in the following table. The mean value maybe considered as corresponding to those values given in thepreceding table. The distribution curves of reflected light from»…
Light · Photometry · Electric lighting
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
