668 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE XVII. 

 Quick Break. 

 r H. A. B. C. 



22 + 17.3 + 7.0 -15.5 



39 + 33.4 +13.8 —27.4 



64 + 60.8 +20.6 —34.3 



168 +127.0 +37.0 -18.9 



360 +168.0 +81.5 +35.5 



Only a few typical numbers are here given but these and many 



others are used in plotting the curves given in Figure 19. The line 



Figure 19. A soft core was used successively with a thick copper shell, 

 with a thinner shell, and without any shell. OS, OT, OU show the remanent 

 fluxes when the magnetizing fields were slowly removed; QV, QZ, QW the 

 fluxes if the field had been suddenly destroyed. 



QW which has QR. as its horizontal axis shows the reversed magneti- 

 zation when the core has no shell. OS, OT, OU show the fluxes for 

 slow breaks, QV, QZ, QW for the quick breaks. 



