Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 220
nd tbetefore nocorrtction is required. This would mean on the basis oftable VI. :— 143 Tungsten Lamps.As llieoriginal units wererather small and thelight-ing would be improved bylarger units with possiblyhiglierefficiency, a reduc-tion in the ratio of 115 to100 may fairly be taken,and we arrive at… … Fig. 0.—Siereo Foundry of The. Tim(< Illumicated by Glow Lamps. Take as an example the rooms inthe first and third columns of TabicVI., and assume another room of,say, 1,800 sq. ft. is to be illuminatedwith a mean illumination of 7 foot-candles. We then get as first api^roxi-mations :— For. (a)…
Lighting
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