Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 52
ield. A type of lighting unit permittingan adjustable concentration of light,without undue intrinsic brilliancy, wouldseem convenient for various types ofscene and depths of stage. While, however, the practice of confin-ing the light in a narrow beam is condu-cive to efficiency, it must be so… … Open Arc. Enclosed Arc (^20 volts). Arc position unstable. Long arc stream. Fig. 7. — Diagrammatic sketch illustratingshadows cast by open and enclosed arcs. the effect of artificial lighting as com-pared with natural lighting on the appear-ance of persons and objects. He stated that the trouble he…
Lighting
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