ADVERTISEMENTS. 



Practical Testing of 



Dpnamos ana motors. 



By CHARLES F. SMITH, 



Wh.Sc., A.M.lnst.C.E., A.M.I. E.E. 



CONTAINS CHAPTERS ON 



General purpose of tests; measurement of armature and field 

 resistances ; production of electromotive force in a dynamo ; the 

 magnetic circuit ; armature reactions ; shunt-wound dynamo ; 

 series dynamo ; compound dynamo ; effect of current in the 

 motor armature ; efficiency tests of a motor ; efficiency tests 

 of a dynamo ; miscellaneous tests ; motor generators and 

 boosters. 



PRESS OPINIONS. 



" For completeness, conciseness, directness, accuracy, clearness of exposition, 

 and intelligent selection of methods, there is nothing in print in the English 

 language that compares with this little book in the slightest degree. It is worth ten 

 times its price." American Electrician. 



" It is seldom the reviewer has had through his hands a book he can more 

 cordially recommend for all-round excellence. The treatment of the subject is 

 thorough and lucid, and the diagrams, and especially the numerous curves got 

 from actual tests, are all excellently reproduced in a very clear manner." 

 Electrical Review. 



" This is an excellent and practical little book. Mathematics are very little 

 employed, the author instead using graphic methods of explanation. It contains 

 a considerable amount of valuable information." The Engineer. 



Price 5s. 4d., Post Free. 



SCIENTIFIC PUBLISHING CO., 



53, New Bailey Street, Manchester, Eng. 



