Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 253
Fig. 1. Typical Workshop Lighting Re-flector for Gas-filled ( Hall-Watt )Lamps. … Fig. 2. Semi-indirect Fitting, Adapted toeither Vacuum or Gas-filled Lamps. open spaces. The catalogue is con-veniently arranged with illustrations andification data on the left, and an in-dication of the polar curve of tin- unit onthe ri^ht. At the commencement there isan up-to-date summary of the…
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
