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 549
Fig. 344 a.—A 20-ton, 3-phase Heroult electric steel furnace fitted withthree 12-inch graphite electrodes. … 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…
Electricity · Magnetism
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