Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 166
Pig. 22. -Weatherproof lantern for gas-filled lamps showing polar curve of candlepower valuesin vertical plane when equipped with a 300 watt-105 volt lamp. … Fig. 23.—Night view of large aeroplane works equipped with 1,000 watt gas-filled lampsin semi-indirect industrial fitting shown in Fig. 21. Lamps spaced 42 feet apart andhung 30 feet above floor. Good example of employment of large units of light on widespacings, thereby reducing the number of…
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
