NOTATION. 



The notation used in this volume follows in the main the recom- 

 mendations of the International Electrical Congress. Non- 

 standard symbols which are used but once or twice are not given 

 in this table ; the significance of such symbols is fully explained 

 whenever and wherever they are used. 



a, /3, <j> and 6 are frequently used for angle. 

 b susceptance of an alternating-current circuit 



[=--*/(r< + *)]. 

 cB magnetic flux density. 

 C condenser capacity. 

 E maximum value of harmonic alternating electromotive 



force. 



E effective value of alternating electromotive force. 

 e instantaneous value of alternating electromotive force. 

 f frequency in cycles per second. 

 g conductance of an alternating-current circuit 



&C magnetic field intensity. 



I maximum value of harmonic alternating current. 

 7 effective value of alternating current. 

 / instantaneous value of alternating current. 

 j square root of minus one, i/ i. 

 L inductance. 

 / length. 



M magnetizing current of a transformer or induction motor. 

 M power component of M. 

 M w wattless component of M. 

 /* magnetic permeability. 



n speed generally expressed in revolutions per second. 

 This letter is frequently used where a number of 

 things, n, is to be represented in a formula. 

 vii 



