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A study of direct and indirect illumination (1912)
Simons, Alexander McDougall · leaf 16
4 … Fig. 3 Distribution of light in a horizontal planearoiind a 200 candle power (250 watt) series tungstenlamp.Lighting · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
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