PEIRCE. — ANOMALOUS MAGNETIZATION OF IRON AND STEEL. 059 



field (47rw//10) due to the current in the solenoid, F is the flux in 

 maxwells through the combination of core and shell, N is the flux 

 through the core alone, and N' is the flux which the core would carry 

 if the whole flux through the system were uniformly distributed. The 

 area of the cross section of the core was about 47 per cent of that of 

 the combination. 



While the slowly built up current is running steadily the flux in the 

 core, which should be nearly half that through the whole combination 

 if the flux is to be uniformly distributed, is very much less. 



When in the case of this combination (Z), the slowly built up current, 

 so directed as to make the flux positive while it is running, is very 

 slowly decreased to zero, the remanent flux through the system is posi- 

 tive, but the flux in the core becomes negative, in the manner indicated 

 by the figures in Table VI. in which F, N, S, are the induction fluxes 

 through the whole combination, the core, and the shell, respectively. 



TABLE VI. 



H. F. N. S. 



50 +86 -322 +408 



100 +122 —410 +530 



150 +132 —370 +500 



200 +141 -318 +459 



250 +149 —265 +415 



300 +155 —213 +368 



While the remanent flux through the system increases regularly with 

 the strength of the current, the oppositely directed fluxes in the shell 

 and the core decrease after reaching maximum values. 



