Magnetic Galvanism. 



79 







Fig. 2. 



* 1 A • • 



1st. A permanent connection, by means of wires, between one end 

 (Fig. 2. a) of the copper coil and the keeper and between the other 

 end, b, and the magnet. The silk-bound wire was wound round the 

 middle of the keeper $, n, covered with silk, and confined between 

 two brass circular plates, faced on the inside with silk (in order to 

 prevent any communication between the centre and outer portion of 



