Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 66
l-Min. 2-Mm 3-Min 4-Min 5-Min 6-Min 7-M.n &-M, Fio. 1.—-The solid spaces represent the wages for intervals of 1, 2, 3, etc., minutes.The ordinates of the horizontal dash lines represent the cost per day for lightingthe area of 1,000 sq. ft. 2, 4 and 6 hours respectively. Note, for example,…
Lighting
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