Alternate Current Transformer. 75 



former liave been expressed in terms of l)y equations identical 

 in form to those obtained in Section I., and which can be 

 reduced to the latter by making Xi.i^x.2i=^0 and dropping 

 insignificant terms. 



From equation (XI.), § 63, we can, as in § 18, express $ in a 

 series of ascending powers of Pa, and thence transform the pre 

 ceding equations, in which the independent variable is 6, to 

 others in which the independent varialile will be P.^ or the 

 output. 



This transformation, and any further discussion of the general 

 equations we have obtained is unnecessary, as it would follow on 

 exactly similar lines to what has been already given in Section I. 



