PREFACE 



IT is coming to be recognised that the design and manufacture 

 of dynamo electric machinery is so extensive a subject that it 

 cannot be sufficiently comprehensively handled in a single treatise. 



In the present work the subject has been approached from the 

 constructional and practical standpoint rather than from the 

 designing and calculating standpoint. Thus, the theoretical and 

 designing elements have not been allowed to predominate, but only 

 enter so far as to facilitate an intelligent appreciation of the 

 various methods and points encountered in the construction. For 

 instance, in the chapters dealing with windings, the subject is dealt 

 with in the aspect of the practical possibilities of the windings, 

 the electromagnetic properties not being considered to such an 

 extent as they would be in a more general or more theoretical 

 treatise. 



The authors wish to take this opportunity of making ac- 

 knowledgment of a great amount of cordially rendered assistance 

 from Mr H. W. Turner, with whom one of the present authors 

 collaborated recently in a treatise entitled The Insulation of 

 Electric Machines. While that work is devoted exclusively to 

 insulation in the manufacture of electric machines, the present 

 work deals in a similar way with armature construction, and is 

 a further illustration of the large and detailed treatment required 

 by dynamo electric machinery. 



In providing illustrations of the various processes in the con- 

 struction of armatures, the authors have been greatly assisted by 

 the receipt of, and the permission to use for this purpose, numer- 

 ous photographs and drawings from manufacturers and designers. 

 We should regret inadvertent omission of the names of any 

 amongst those who have in this manner so greatly assisted us, 

 but we believe that the -complete list consists of Messrs Alioth 

 of Basel, The British Electric Plant Co. of Alloa, Messrs Adolf 



