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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 165
\ /\ ANGLE CP lANGLE C.P 0 1060 50 : I2SO 10 1120 | 60 1 920 20 1180 70 1 150 30 1280 40 1330 1 AA/rf b\±\^SS?yiW^f^-- ;>.._; CP -. r CP 0 iSSO 50 375 10 550 60 1200 20 soo 70 COO 30 573 80 ITO 40° 573 Sore LampLamp 4 Rfflecfcr Fra 2o.- -Polar curves of light; distribution showing candlepower… … vSvr <^ ANGLE C P 0° 600 tt ~l~& [ J\V\. 10° 620 20° 600 30° 585 4-0° I 563 50° 515 60° 450 70° 375 80° 250 90° 142 4lL-+---t\\ 100° 132 110° •66 1 S( olL-V^y 120° 24 J_6J Fig. 21.—Semi-indirect fitting, semi-enclosed industrial type, for gas-filled lamps with polarcurve of candlepower…Lighting
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