Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 271
-hand holderthere was a 40-watt lamp, and in the threeothers 60-watt lamps. This asymmetry Opening 2. 6wideby 5 3 high o o o o o o o O O O O O O G Fig. 13.—Range at the General Post Otlke.Sketch plan of lamp and target disposition. For night shooting, a transverse battenwith four electric lamps is… … Fig. 14.—An Army range in Surrey.Disposition of targets and lamps. batten is supported at each end in agrooved block on the wall, and it wasnoticed that by rocking the batten in thegrooves the target illumination could bevaried considerably. The position nor-mally assumed by the batten throws…
Lighting
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