Dynamos and motors; a text book for colleges and technical schools (1911)
Franklin, William S. (William Suddards), 1863-1930, Esty, William, 1868-1928 · New York The Macmillan company · leaf 299
rnating current is utilized,20 290 DYNAMOS AND MOTORS. the negative wave of current being blocked by the aluminumvalve. iMgure 20gb shows four aluminum valves so arranged asto cause both waves (the positive wave and the negative wave)of the alternating current to flow in the same direction througha… … Fig. 209a. lead (Pb) and aluminum (Al) submerged in a slightly acidsolution of potassium phosphate. The current flows freelythrough such an electrolytic cell in the direction of the arrowsin Fig. 209, but a reversed current forms a thin insulating coat-ing of aluminum oxide over the aluminum…
Dynamos · Electric motors
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