of Magneto-Electricity. 

 Series No. 1. 



267 



Having thus detected the evolution of heat from the coil of 

 the magneto-electrical apparatus, my next business was to 

 confirm the fact by exposing the revolving electro-magnet to 

 a more powerful magnetic influence ; and to do so with the 

 greater convenience, I determined on the construction of a 

 new stationary electro-magnet, by which I might obtain a more 

 advantageous employment of the electricity of the battery. 

 Availing myself of previous experience, I succeeded in pro- 

 ducing an electro-magnet possessing greater power of attrac- 

 tion from a distance than any other I believe on record. On 

 this account a description of it in greater detail than is abso- 

 lutely necessary to the subject of this paper will not I hope 

 be deemed superfluous. 



A piece of half-inch boiler plate iron was cut into the shape 



Fi2. 3. 



* Throughout the paper I have called that quantity of current unity, 

 which, passing equably for an hour of time, can decompose a chemical equi- 

 valent expressed in grains. 



