Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 353
/ 11 ^ V 1 -• le ^ / y f J 10 \ N / \ 1 k / \ / f- s k; 7 *-/ 0* s^ y * - OJ ■ ■^^ ■^. -B. _- -^ ~ u _ _ 10 :o 9j 40 so 60 70 I 100 110 120 130 140 ir.O 160 VO ISO Ij Fig. 6. Horizontal Illumination alongground at Kerb Line in Cheapside. CurveA=Illumination until midnight. Mean=l-23candle-ft.… … FiG._7. Polar Curve of 12iamp. ExcelloArcs with Dioptric Inner and Semi-opalescentSpherical Outer Globes (Farringdon Street).Height of Lamp 25 ft. Gin. Spacing about175 ft. Width of road 100 ft. s / / \ r y / \ / S, / N S / / •N^ ^ ^ 10 30 30 40 S) 6) 70 *J SO 10) 110 120 1!0 14) 160 161 170 130…
Lighting
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