Abstract
THE first edition of this work appeared in 1904. Since then remarkable advances have been made in electrical engineering. A foremost place in this progress must be given to electric motors, and more especially to that class employing commutators, in connection with both single and poly-phase alternating currents. Indeed, the electrification of railways has made the variable-speed single-phase motor with a good starting torque indispensable, for at present the single-phase system alone seems to fulfil the requirements of main line electric traction. Also the polyphase induction motor is no longer to retain the great disadvantage in the matter of speed regulation, which makes it inferior to the continuous-current shunt motor, for successful means are now known whereby the speed may be varied economically over a wide range.
Electric Motors. Continuous, Polyphase, and Single-phase Motors: Their Theory and Construction.
By Henry M. Hobart. Second edition, entirely rewritten, revised, and enlarged. Pp. xxiv + 748. (London: Whittaker and Co., 1910.) Price 18s. net.
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SMITH, S. Electric Motors Continuous, Polyphase, and Single-phase Motors: Their Theory and Construction . Nature 85, 468 (1911). https://doi.org/10.1038/085468a0
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DOI: https://doi.org/10.1038/085468a0