Chemistry and Physics. 61 
without breaking circuit, and then the object can be taken out 
Without stopping the alternating current. One of the coils we 
Perfect demagnetization is attained with varying difficulty. 
Ordinarily, it is rapidly and easily accomplished. Sometimes a 
With a reverser arranged for varying speeds. oe . 
ne application to this method is to the demagnetization of 
Watches. Watches strongly magnetized are completely demag- 
netized by one to three minutes’ exposure in the coil, Frequently 
unsuspected traces of magnetism cause annoying irregularity of 
ction of a watch. This method enables us entirely to remove 
this difficulty, 
nothe pure 
metic, and was demagnetized with great difficulty. 
Isplayed no general olarity, having consequent points irregularly 
distributed. After demagnetization it received induced magnetism Ce 
