A. Rowland — Studies on Magnetic Distribution. 



.. 



•257. 



B. 



A. 

 1-303. 





z 



!a 



2-? 





6-1 



8-2 



9-6 



6 



7-9 



11-5 



21-3 









16-8 







150 



27-4 















9-8 



21-5 













20 



36 



16 5 



half the bar 

 Table ^ 



Here the greatest change is observed in the part covered by 

 the helix, though there is also a great change in the other part 



Plot of Table IX, showing surface-density 



magnetizing- 



These tables show that, as the magnetization of the bar in- 

 creases, at least beyond a certain point, the curves on the part 

 covered by the helix increase in steepness ; and the figure even 

 shows that near the middle of the helix an increase of magnet- 

 izing-force may cause the surface-density to decrease j and Table 

 VIII. shows this even better. Should we calculate Q", how- 

 ever, we should always find it to increase with the magnetizing- 

 force in all cases. These effects can be shown also in the case 

 where the bar does not extend beyond the helix, but not 

 nearly so well as in this case, seeing that here Q'' can obtain a 

 greater value. 



Assuming that p- is variable, the formula indicates the same 

 change that we observe ; for as Q" increases from zero upward, 

 l-i will first increase and then decrease ; so that as we increase 

 the magnetizing-force from zero upward, the curve should first 

 decrease in steepness and then increase indefinitely in steepness. 



