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 330
l appearance of an Carbon Terminals arc between two carbon electrodes when maintained by direct-current. Action of Current on Carbons. Here the current is assumed aspassing from the top carbon to the bottom one as indicated by thearrow and signs. We find, in the direct-current arc, that most ofthe… … 32 ELECTRIC LIGHTING ture at which the carbon vaporizes, and it gives from 80 to 85 percent of the light furnished by the arc. The negative carbon becomespointed at the same time that the positive one is hollowed out toform the crater and it is also incandescent but not to as great adegree as the…
Electrical engineering
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