Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 272
t glance that theend and centre targets on this rangewere of little use. The range is usedby a voluntary training corps andis lighted by two 3-mantle invertedincandescent gas lamps placed behindiron screens, as shown in Fig. 18. Thescreens were originally whitened behindthe lamps, but at the time… … Fig. 17.—A range having a high ratio of maximum to minimum target illumination. 266 THE ILLUMINATING ENGINEER (june) downwards on the ground in front of thetargets, and there is no doubt that if thesix mantles were redistributed along the
Lighting
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