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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 155
C.P. Anon A B 0* 124 840 10° 207 940 20° 455 1000 30* 598 1200 40 795 1350 50° 895 1490 60° 970 1550 70° 1020 1500 80° 1060 161 0 j 90° 1070 1440 100° 1080 1450 110° 1020 1480 120° 980 1410 130° 920 1250 140° 870 1170 150° 650 900 160° 355 645 170° 14-8 390 180° 26 Fig. 4.—Polar curves of light…Lighting
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