UPON MAGNETISATION, AND CONVERSELY, IN IRON, STEEL, AND NICKEL. 499 



(B v /B and B v - R v /B — R) are to the left, the values of the induction ordinates to the 

 right. It may be repeated that H and B are in C.G.S. units in all the diagrams. 



lOfV- 



9 



I 



\ 



\ ANNEALED 



B. CONDITIONS 



\ 



R 

 B 



R 



Bv« 



Rv 



v/ /b- b v -r v /b-r 





\ \ 



Fl G.V NICKEL 



EXPERIMENTAL RESULTS. 



Permeability. — Permanently acting vibrations increase permeability. B v /B is 

 approximately a maximum when c?B v /c7H is a maximum. But the actual difference 

 TRANS. ROY. SOC. EDIN., VOL. XLV. PART II. (NO. 17). 70 



