Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 431
e donot walk as rapidly as those at the other. The wave will then advance through the glassin a straight line but in a direction OB. At B the wave will again pass into the air. Thepart which was first to enter at O, is the first to emerge at B. The direction of the waveis again changed and it… … FlGS. 3,469 to 3,471.—Distribution of light by holophane globes. Globes of the type shown irfig. 3,469 throw a maximum light at an angle of 45 degrees downward and are used prin;cipally for general illumination. The globe in fig. 3,470 throws the light around, ancthe arc in fig. 3,471 general…
Electrical engineering
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