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 430
ss. By using an alternatingcurrent, the arc formed by one-half of the alternating-current wavetravels upward from the electrode and on the reversal of the currentan arc is formed which travels downward, and these arcs are formedat the rate of fifty per second, in accordance with the frequency ofthe… … Fig. 48. Birkeland-Eyde Furnaces at Notodden SO that it travels parallel with this disk and is, therefore, fully ex-posed to the action of the discharge. It is estimated that the temperature of the disk is about 2300° C.The furnace is of steel, lined wdth fire-bricks which are perforated byholes…
Electrical engineering
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