xii CONTENTS. 



PACE. 



CHAPTER V. 

 TRANSFORMERS. 

 EXPERIMENT 5~A. Preliminary Study and Operation of a 



Transformer 128 



EXPERIMENT 5~B. Transformer Test by the Method of Losses. 150 

 EXPERIMENT 5-C. Circle Diagram for a Constant Potential 



Transformer 179 



CHAPTER VI. 

 POLYPHASE CURRENTS. 



EXPERIMENT 6-A. A General Study of Polyphase Currents 196 



EXPERIMENT 6-B. Measurement of Power and Power Factor 



in Polyphase Circuits 222 



CHAPTER VII. 



PHASE CHANGERS, POTENTIAL REGULATORS, ETC. 



EXPERIMENT 7~A. Polyphase Transformation 241 



EXPERIMENT 7-6. Induction Regulators 250 



CHAPTER VIII. 

 INDUCTION MOTORS. 



EXPERIMENT 8-A. Preliminary Study of an Induction Motor 



and the Determination of its Performance by Loading 257 



EXPERIMENT 8-B. Predetermination of the Performance of an 



Induction Motor by Means of the Circle Diagram 278 



CHAPTER IX. 



INDUCTION MACHINES: FREQUENCY CHANGERS AND INDUCTION 



GENERATORS. 



EXPERIMENT g-A. Operation and Test of a Frequency Changer 



( Secondary Generator) 291 



