St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 129
Figs. 1S5 to 1S9. have heretofore resisted attempts at welding, and havehad to be brazed or soldered. The introdu(5tion of the eledlric transformer enablesenormous currents to be so applied to the weld as to spendtheir energy just at the point where heating is required. HEAT PRODUCED BY ELECTRIC…
Electricity
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