Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 365
e illumination of a room withdifferent arrangements of the units of light, assume a room 16 feetsquare, 12 feet high, and with walls having a coefficient of reflectionof 50 per cent. Consider first the illumination on a plane 3 feetabove the floor when lighted by a single group of lights mounted… … 1 .5 = c. p.- X 12.82 1-.5 DD I since d = Vs^+SH^ = 12.8 (See Fig. 47).Solving for the value of c. p., we have .5 c. y. 164^.5 = .5X82 = 41 ^ Three 16-candle-power lamps would J serve this purpose very well.J^ To determine the illumination directly •^ under the lamp, we have Fig. 47. Diagram…
Electrical engineering
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