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 372
sines, etc., the work is rendered less burdensome, but theflux-of-light method involves less of numerical calculation and givesexcellent results in the majority of cases. Of the various methodsof procedure which might be followed in making calculations by theflux-of-light method only one will be… … Fig. 49. Prototype Curve for Semi-IndirectLighting. Scale 100 Unit Directly Upward 333 70 ELECTRIC LIGHTING TABLE XllI Percentage of Total Lumens from Light Sources Which Are Effectiveunder Different Conditions Walls Ceiling REFLECTORS 1 Bare Prismatic Prismatic SteelPorcelain WhiteGlass…
Electrical engineering
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