SUGGESTIONS TO TEACHERS 



(1) THIS book is intended to be used as a text in a course 

 which comprises lectures, recitations, computing periods, and 

 home work. Purely descriptive matter has been omitted or only 

 suggested, in order to allow the teacher more freedom in his 

 lectures and to permit him to establish his own point of view. 

 Some parts of the book are more suitable for recitations, others 

 as rei in the computing room, others, again, as a basis for 

 discussion in lectures or for brief theses. 



(2) Different parts of the book are made as much as possible 

 independent of one another, so that the teacher can schedule 

 them as it suits him best. Moreover, most of the chapters are 

 written according to the concentric method, so that it is not 

 necessary to finish one chapter before starting on the next. One 

 can thus cover the subject in an abridged manner, omitting the 

 last parts of the chapters. 



(3) The problems given at the end of nearly every article are 

 an integral part of the book, and should, under no circumstances, 

 be omitted. Th< TC is no royal way of obtaining a clear under- 

 standing of the underlying physical principles, and of acquiring 

 an assurann- in their practical application, except by the solution 

 of numerical examples. It is convenient to assign each student 

 the ( specifications of a machine of each kind, and ask 

 him to solve the various pr<>l>l< m> in the text in application to 

 these machines, in proportion as the book is covered. Numer- 

 ous specifications and drawings of electrical machines will he 

 found in the standard works of E. Arnold, H. M. Holart. 

 Pichelmayer and others, mentioned in the footnotes in the 

 text. A first-hand acquaintance with those classical works on 

 the p.-irt of the -tu. lent is very desiraMe. however superficial thi- 

 acquaintance may be. 



xl 



