. Electric railway journal . ieswith the arc to absorb the excess voltage. With theordinary supply circuits the voltage absorbed by therheostats is a large part of the total energy. Theamount of power required depends largely on thesource of supply. In order to avoid losses the General Electric Companyhas developed a line of special, low-voltage generatorsand a method of control. The generator is wound for avoltage of from 60 to 75 volts, and the control equipmentconsists of a main generator panel with or without awelding control circuit, with a separate auxiliary pane!for each operator. In se
. Electric railway journal . ieswith the arc to absorb the excess voltage. With theordinary supply circuits the voltage absorbed by therheostats is a large part of the total energy. Theamount of power required depends largely on thesource of supply. In order to avoid losses the General Electric Companyhas developed a line of special, low-voltage generatorsand a method of control. The generator is wound for avoltage of from 60 to 75 volts, and the control equipmentconsists of a main generator panel with or without awelding control circuit, with a separate auxiliary pane!for each operator. In series with the arc is a grid 344 Electric Railway Journal Vol. 54, No. 7 rheostat for varying the current by means of a dialswitch connected to taps in the rheostat. An automatic control equipment is provided to pro-tect the generator without affecting other operatorswhose welding circuits may be connected to the samegenerator. It consists of a protective relay controllinga shunt contactor in the welding circuit. The relay is. ARC WELDING TRANSFORMER, AND TRANSFORMER REMOVED FROM CASING provided with an oil dashpot to prevent operation onmomentary fluctuations of current. The setting of the dial switch on the welding paneldetermines the amount of resistance in series with thearc and therefore controls the current used. Beforestarting the arc the operator sets the dial switch for theamount of current required for the work. If, however, the operator leaves the electrode in con-tact with the work too long, or takes too much cur-rent after having drawn the arc, the protective relajopens the exciting coil of the contactor which in turn
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