An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 548
the points in contact, they are squeezed to-gether a certain amount, the current is shut off, and the weldis complete. This is the process developed by ProfessorElihu Thomson. The apparatus which is generally used inthe Thomson welding process is: (1) an alternator, usuallygiving a frequency of… … Fig. 344 a.—A 20-ton, 3-phase Heroult electric steel furnace fitted withthree 12-inch graphite electrodes.
Electricity · Magnetism
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