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Nature volume 49, page 122 | Download Citation



To those desirous of obtaining a general knowledge of the principles used in the calculation of the efficiency and of the dimensions of polyphase motors, &c., this book will be of considerable use. In the first part, the calculation of the dimensions of, and losses in, the conductors conveying the currents are worked out at some considerable length, numerical examples being given. In the other sections the generation of polyphase currents, motors with rotating fields, and transformers are dealt with; in each case the general principles of the machines now in use being described, though no account is given of the details of their construction. There is also a short account of some of the plants for the transmission of energy by polyphase currents which have been installed, with a table summarising the tests and measurements made during the Frankfort Exhibition.

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