41 



stand-still, and if the self-induction is 

 not sufficient, tins may eventually cause 

 it to burn up. 



It has been shown by Mr. H. Wilde* 

 and by Dr. J. Hopkinson,f that two similar 

 alternators can be coupled in parallel to 

 the same circuit; and Professor Adams 

 described, in a paper read in 1884 before 

 the Society of Telegraph-Engineers and 

 Electricians,^: some experiments in which 

 he succeeded in driving an alternator as 

 a motor,current being supplied by another 

 alternator of similar construction. Mr. 

 Westinghouse, in some central stations 

 in America, has also worked alternators 

 in parallel. There is thus sufficient ex- 

 perimental proof that such a method of 

 working is possible, and the only question 

 which remains to be investigated is 

 whether, for safe working, any very 



* Proceedings Lit. and Philosophical Society of Man- 

 chester. Vol. viii. p. 62: and "Philosophical Magazine," 

 January, 1869. Fourth Series. Vol. xxxvii. p. 54. 



t The Inst. C. E. Lectures on "The Practical Appli- 

 cations of Electricity.'" Session 1882-83. "Some Points 

 in Electric Lighting." By Dr. J. Hopkinson. 



% Journal, vol. xiii. p. 515. 



