V. 



INDEX. 



PAGE. 



Transformer Diagrams 183 



Transformer, Effect of Lag in 

 Secondary Circuit 156 



Transformer Efficiency by Split 

 Dynamometer 166 



Transformer Efficiency by 

 Sumpner's Method 170 



Transformer Efficiency Tests 



157, 160 



Transformer Efficiency Tests 

 by Double Conversion 166 



Transformer Efficiency Tests 

 Indirect Methods 161 



Transformer, General Principles 125 



Transformer, Graphical Deter- 

 mination of Drop at any 

 Power Factor 162 



Transformer, Insulation Losses 

 due to Defective 145 



Transformer, Iron Losses 148 



Transformer, Iron Losses, 

 Separation of 149 



Transformer, Magnetic, Leak- 

 age 154, 187 



Transformer, Maker's Tests 177 



Transformer, Measurement of 

 Ratio of Transformation 137 



Transformer, No-load Current 139 



Transformer, Power Factor, 

 Drop at any 162 



Transformer, Ratio of Currents 127 



Transformer, Test of Uni- 

 formity of Conversion Ratio 178 



Transformer, Tracing Curves of 190 



PAGE. 



Transformer, Voltage Drop ... 129 

 Transformer, Voltage Drop, 



Determination of 130, 135 



Triangle of Voltages 24, 31 



Unit Pole, Definition 1 



Vector Diagrams 2J 



Vectors, Resultant of Two ... 23 

 Values of Direct and Alter- 

 nating Currents 89 



Virtual Value of Current... 90, W7 



Volt-amperes 59 



Voltage, Component and Re- 

 sultant 18, 32 



Voltage, Energy and Idle 64 



Voltage of Transformer 126 



Voltage Ratio of Rotary Con- 

 verter 318 



Voltage, Tracing Wave Form 



of 87 



Voltage, Triangle of 24, 31 



Voltmeters, Cardew, Scale of 91 

 Voltmeters, Three, for 



Measurement of Power 77 



Wattless Current 74 



Wattmeter 57 



Wattmeter Connection in a 



3-phase Circuit 305 



Watts, Apparent 59 



Watts, Curve of 58 



Watts in Alternating Circuit 57 



Wave Form, Tracing of 84 



Wave Forms, Composition of 420 



