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 379
th ordinary vision. Ordinarily the maximum amount of light should be given off in a directionabout 20 degrees below the horizontal. The light should be steady, asflickering is always objectionable. The light should be well diffusedso as to avoid deep shadows. The light sources should bemounted… … Fig. 54. 340 ELECTRIC LIGHTING 77 amount of illumination considered as essential for the streets in thedifferent sections of a city as follows: Principal Business Streets. Principal business streets requireillumination of from 0.25 to 1.00 foot candle, as uniform as possible;flaming arc lights,…
Electrical engineering
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