Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 326
zda lamps to an intensity of 3.5 foot-candles. If clear Holoplane reflectors are used, the values forlumens effective on the plane may be increased 10 per cent,due to reflection from fairly light walls. The lamps in this caseare to be of the 40-watt type which in the table are rated at 160lumens.… … ENCLOSING UNIT SEMI- INDIRECTUNIT Fig. 219. COLOR MATCHING UNIT Reflectors.—The character and form of reflectors have muchto do with the effective distribution of the light produced bythe lamp. The most efficient form of reflectors are made ofglass and designed to project the light in the desired…
Heating · Lighting · Plumbing
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