NOTE A, PAGE 11. 



Life of Faraday, by Bence Jones. London: 

 Vol. II., p 285. 



NOTE B, PAGE 12. 



Faraday's Experimental Eesearches. Vol. I., p. 

 1, and plate. 



NOTE C, PAGE 12. 



A full account of this is in Bence Jones' Life of 

 Faraday, Vol. II., p. 1 to 6. Faraday tried it in 

 1824, '25, and '28, and failed each time; although, 

 since magnetism had been developed from electric- 

 ity, the converse of the problem seemed very 

 feasible. On the 21st of September, 1831, he tried 

 the experiment with an iron ring electro-magnet, 

 constructed according to Henry's invention, using 

 an intensity battery of ten pairs. One-half of the 

 ring was wound with 72 feet of insulated wire; and 

 the other half with about 60 feet, in the circuit of 

 which a galvanometer was placed. When the 

 battery was closed upon the first circuit, the iron 

 ring became magnetic, and a current of electricity 

 was set up, by induction, in the second circuit, 



