International Library of Technology · Scranton, International Textbook Co. · leaf 385
he frameof the lamp and the carbons themselves. The open arc §18 ELECTRIC LIGHTING. 17 throws out comparatively little light in the horizontal direc-tion, and the quantity of light thrown upwards is small.It is thus seen that the plain open-arc lamp using a directcurrent as it stands, without any… … SO 30° Fig. 13. downwards at an angle of about 45°, where it is most needed.This is one of the reasons why the direct-current open-arclamp has proved so successful for street lighting. If thedeep shadows directly under the lamp are objectionable,they may be softened by using a clear globe with the…
Electrical engineering
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