. American engineer . t physically by mak-ing it soft and ductile, the welding pencil or electrode is cov-ered with a flux. When the welding operation is carried on, theflux melts and vaporizes, enclosing the molten particles and thearc to the exclusion of atmospheric oxygen which attacks the re- Fig. 17—Rocker Arm Repaired and Ready for Service. be either of the direct or the alternating current type. The gen-erator is wound to furnish a maximum constant output of 200amperes direct current at a range in potential of 50 to 80 range in voltage is secured by varying a resistance inser
. American engineer . t physically by mak-ing it soft and ductile, the welding pencil or electrode is cov-ered with a flux. When the welding operation is carried on, theflux melts and vaporizes, enclosing the molten particles and thearc to the exclusion of atmospheric oxygen which attacks the re- Fig. 17—Rocker Arm Repaired and Ready for Service. be either of the direct or the alternating current type. The gen-erator is wound to furnish a maximum constant output of 200amperes direct current at a range in potential of 50 to 80 range in voltage is secured by varying a resistance inseries with the field circuit. A variable rheostat for this purposeis mounted on the slate switchboard so that it may be conveni-ently manipulated by the operator. A second resistance is placed in one leg of the welding circuitin such a position that when the generator is short circuited atthe instant of striking the arc the resistance acts as a protectionto the armature and comnnitator of the generator by limiting the. Fig. 18—Outside of Cracked Cylinder Which Had Been Repairedby Welding. Fig. 19—Inside of Cracked Cylinder Which Had Been Repairedby Welding. FEnRiAKV, 1912. e3 niaximuni current possible at a maxinnmi voltage to the greatestpermissilile iiislaiitanenus overload capacity of the resistance is provided wliicli is antoniaticallx thrown in the generator when the welding operation has ceased. The in-stant the welihng is started again, this latter resistance is auto-nialically cut out. ihese two resistances arc so proportioned
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
