Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 80
stinct gain in visual acuity. Mr. H. H. Johnson {communicated) :—This Society is to be congratulated inbringing forward for discussion such animportant subject as Searchlight Pro-jectors: it is difficult to find any otherelectrical plant or apparatus where somuch contention exists concerning… … Fig. 1.—Standard horizontal hand and automatic projector lamp of the Crompton solenoid type, with an iron deflector fitted to keep the arccentral. (Mr .H. H. Johnson.)
Lighting
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