388 Mr. F. J. Smith on the Effects of Magnetism 



of deflexion before the current is put on ; No. 2 the position 

 of deflexion with current on ; No. 3 the new position to which 

 the deflexion has come. This was the starting-point of the 

 next deflexion. The magnetic force produced in all cases an 

 increase of torsion in the direction of the initial torsion, so 

 that in each case the amount of twisting in the direction of 

 torsion was 2, and the untwisting about 1 in each set of 

 magnetizations and demagnetizations. The wire did not 

 untwist when left to itself, at least perceptibly in 100 

 minutes, but the untwisting after magnetization was im- 

 mediate. 



Fig. 1. 



*f 





/ 





\ 



2 * 



2 ii 



2 * 



t\ 



2 v 



2 & 



Step by Step Untwisting of Nickel. 



11. Rods of non-magnetic metals (Cu, St, Pt, Pb, Ag, Zn, 

 Cd, brass, and bronze) were subjected to the same treatment as 

 the iron rods, but no rotation of any kind could be seen. 



12. A rod of bismuth was next prepared by being drawn 



