ALTERNATING-CURRENT TRANSFORMER. 



161. I wish to impress upon the reader that there is little in this 

 contribution that I can claim specially my own. I have merely com- 

 bined the diagrams of Kapp, Steinmetz, and Blondel, simplifying 

 wherever it was possible. The application of the principle of recipro- 

 cal vectors* enables us in a surprisingly simple manner to trace out 

 the intricate phenomena in the transformer for constant potential, if 

 CAPACITY IN SECONDARY. 



t/,-0.80 

 V.-0.75 



P - Q 



Fig. 48. 



we want to include the primary resistance. My method of arriving 

 at the diagram of the general transfomer is different from Dr. Be 

 dell's in so far as he uses the coefficients of self- and mutual in- 

 duction, a method which I cannot advocate. 



'The method of reciprocal vectors was admirably treated in 1878 by Prof. W. 

 K. Clifford in the chapter on "Pedal and Reciprocal Curves" in his work on "Ele- 

 ments of Dynamic." But Dr. Bedell first applied the principle to the transformer. 



87 



