Alternating-current motor windings : covering the design and manufacture of winding for all types of A.C. motors, frequency changers, boosters and convertors. Hopwood, Harold. Armatures. Electric motors, Alternating current. 621.31913 H799a Includes index. Lond. : Newnes, c1950. c1950. 1950 Text viii, 320 p. : eng