Polyphase commutator machines / by B. Adkins and W. J. Gibbs. Adkins, Bernard. Gibbs, W. J., joint author. Electric motors, Polyphase. Commutation (Electricity) TK2789 .A3 621.31363 ADP Bibliography: ( p. 225) and index. Cambridge : University Press , 1951 . 1951 . 1951 Text xiv, 230 p. eng