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 409
\ ZLW ^ 900 \ / t 1050 \. \ Fig. 71. Photometric Curves forPrismatic Reflectors. .A-BowlFrosted Tungsten Lamp; B-SameLamp with Extensive Type Re-flector; C-Same Lamp withIntensive Reflector; Z)-SameLamp with Focusing Type Re-flector 365 102 ELECTRIC LIGHTING be lined with porcelain enamel, or a… … Percentage Light Flux Unit. Total light from lamp Light absorbed by reflector.Light in upper hemisphere. ,Light in lower hemisphere. .Light in 60° zone A B 100.0 100.0 37.0 18.6 0.0 0.0 63.0 81.4 53.4 59.2 100.0 14.8 6.4 78.8 41.3 Fig. 72. Types of Metal Shades and Characteristic Distribution…
Electrical engineering
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