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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 330
Ftg. 1.—General view and section of Tuck Illumination Photometer. … Fig. 2.- -General view of Holophane FilterliteUnit. /\^ \— ^~t~~ \7 \ yS vI^JL r~/^% x ^ JjniiHt ^ x ^cOv^X/X v>^r\\ ■>s.--^S^ \ 1 ! 1 \ sc/ r^r^ / uww tKn»w<ev L 1-1200-I3QO — I6SO — S75 Fig. 3. -Distribution of light from HolophaneFilterlite Unit. Measurements of illumination are mad*by…Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
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