VARIOUS GENERATORS OF ELECTRIC LIGHT. 65 



We shall now enter into some details of the parts of these 

 achines. 

 The magnets are, as we have said, of a horseshoe form. 



and come from the workshops of Allevard ; they weigh about 

 20 kilogrammes each, and are composed of five or six plates 

 of tempered steel, fitted to each other by grinding, and held 

 together by screws; the thickness of each plate is about 



5 



