Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 379
Fig. 422.—Light distribution in avertical plane, from a 32 candle-powertungsten lamp. Fig. 423.—One type ofarc-lamp mechanism. unless the direction of the light is specified, and curves such asthat in Fig. 422 are used for this purpose. This curve shows thedistribution of light about the vertical…
Electrical engineering
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