. An elementary book on electricity and magnetism and their applications. Fig. 344 a.—A 20-ton, 3-phase Heroult electric steel furnace fitted withthree 12-inch graphite Fig. 345. — Thomson automatic electric welder with step-down transformer incase beneath. The secondary winding is but a single turn. The regulatorswitch is on the outside of case at left. On top is a stationary head (left)and a movable head (right) to hold the pieces to be welded. The com-pression lever with switch handle are at the extreme right. ELECTRIC HEATING 491 Figure 345 shows a complete Thomson welder. The
. An elementary book on electricity and magnetism and their applications. Fig. 344 a.—A 20-ton, 3-phase Heroult electric steel furnace fitted withthree 12-inch graphite Fig. 345. — Thomson automatic electric welder with step-down transformer incase beneath. The secondary winding is but a single turn. The regulatorswitch is on the outside of case at left. On top is a stationary head (left)and a movable head (right) to hold the pieces to be welded. The com-pression lever with switch handle are at the extreme right. ELECTRIC HEATING 491 Figure 345 shows a complete Thomson welder. The trans-former is seen in the center of the case, the clamps are on lever at the right is for squeezing together the heated rodsheld in the clamps. In welding heavy work hydraulic pressureis used to squeeze the weld. 336. Arc welding. Another process of utilizing the heatingeffect of electricity for the purpose of welding and workingmetals is that known as the arc process. This was developedby a Russian named Bernados and is particularly suitable forrepairing broken pieces of cast and wrought iron. In thisprocess a continuous current is used of from 200 amperes up,d
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
