PEIRCE. — ANOMALOUS MAGNETIZATION OF lEON AND STEEL. 661 



while the remanent flux in the core was positive just as it was when the 

 current was running through the solenoid circuit. See Table VII. 



At H= 1100 gausses F gave a negative throw far off-scale, and N a 

 similar positive throw. At this excitation, however, the solenoid cur- 

 rent had to be so strong as to heat the coil rapidly and we did not 

 attempt to make careful determinations of these fluxes. If F were 

 plotted against H we should get a curve of the form shown in 

 Figure 13. 



All the combinations of shell and core that we have used give a set 

 of fluxes for the F column which vary with the excitation in much the 

 same way that the whole flux for Z does. There is always — so far as 

 my knowledge goes — an increase in N from a low value near the out- 

 set to a rapidly increasing one at high excitations, but sometimes the 

 increase is regular and sometimes not. As an instance of a very rapid 

 increase in N beginning near a given excitation, I may cite the case of 



