A COMPANION VOLUME. 



By the same Author. 



Practical Testing of 

 Dynamos & Motors. 



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 ; effi- 

 ciency tests of a motor ; efficiency tests of a dynamo ; mis- 

 cellaneous 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 excel- 

 lence. 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. Mathe- 

 matics 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 



