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 432
part at the equator 12 Four null values at the south pole of the lamp 1 Total number of effective measurements 38 586 ELECTRIC LIGHTING 123 The points thus laid off on the reference sphere are ajiproximately equi-distant, being somewhat closer together at the equator than at the poles. When the… … O/O°2030° ^5° 60° 75° 90° I05 120° /35° /SO 165°ISO Fig. 97. Rousseau Diagram for Gem Lamp with Bowl Reflector The mean spherical candle-power from these readings may bestbe obtained by plotting a distribution curve from the readings, deter-mining the area of this closed curve by means of a…
Electrical engineering
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