170 



of force had begun to clear out of the 

 iron, the action would go on rapidly, in 

 spite of the opposing action of the in- 

 duced current, owing to the molecules of 

 iron assisting the demagnetization, the 

 curve of induction being something like 

 the firm line, while the curves of current 

 were like the dotted line in Fig. 36. In 

 the same way, if the moving iron was 

 whirled past alternating polarities, the 

 curves of induction and of current would 

 still be unsymmetrical and unsymmetric- 

 ally disposed with regard to the times of 

 coincidence of the axes of the fixed and 

 moving magnets (Fig. 37). 



Mr. W. M. Mordey was glad the author 

 had adopted his term " Alternator." The 

 old term "alternating-current dynamo- 

 electric machine" was very cumbrous. 

 Alternators might be divided into two 

 classes, those which had iron in the arma- 

 tures, and those which had not. As his 

 own machine, made by the Brush Corpora- 

 tion, and that of Ferranti, were the only 

 examples of the latter class described 

 by the author, he might be permitted 



