Dynamo-Electric Machinery - A Manual for Students of Electrotechnics #262097

Since the publication of the first edition of this work in the autumn of 1884, much has been done towards perfecting the dynamo, both in practice and in theory. Additional matter has accordingly been added, involving an increase of one hundred and ten in the number of pages and of ninety-four in the number of cuts.<br><br>The new matter is partly embodied in the text and is partly added in the form of Appendices. The latter half of Chapter V. on the Reactions between the Armature and the Field Magnets has been re-written, introducing a section on the heating of pole-pieces. The dynamos of Class I. are now divided into two sub-classes, those in which the windings are united into a closed coil, and those in which an open-coil arrangement is adopted. Many additional forms of dynamo, including the latest designs of Gramme and of Siemens, have been added: and the reader will not fail, on comparing the latest Gramme (Fig. 92) with the latest Siemens (Fig. 129) to perceive a curious assimilation of type. Chapter XI. on Machines for Electroplating and Metallurgy is entirely new. Chapter XIX. on Coupling two or more Dynamos in one Circuit is also new: the author is indebted to Mr. W. M. Mordey for the section upon the coupling of compound dynamos, and to Mr. R. M. Walmsley, B.Sc., for the summary of Hopkinson's researches upon the coupling of alternate - current dynamos and for the, geometrical illustrations which accompany it.