BABBITT. — THE VON WALTENHOFEN PHENOMENON. 



253 



in the way of experimentation were sufficiently great without unneces- 

 sary additions, the effect of which was unknown ; thus immediately 

 after the discovery, core II was discarded and core I made. 



The first two sets of data given below were taken in the following 

 manner. The iron was demagnetized and the galvanometer tested. 

 Then the magnetizing field was applied in one or more steps, as 

 is indicated. A repetition of 

 this process yielded the data 

 under discussion. It is to be 

 observed that the flux change 

 recorded is that taking place 

 when the iron is carried from 

 zero magnetization to the first 

 peak of the hysteresis curve. 



First Set of Data. 

 The iron was demagnetized 



Test op Galvanometer. 



The iron was demagnetized iqc 

 by transformer and the field 

 built up in one step : 



Amperemeter 

 Reading. 



1.220 



Ballistic 

 Throw. 



20.76 



2 REVERSALS 6 X 



Figure 15. Set IV: B 10,100: second 

 magnetization; .Q indicates 1-step reversals; 

 X 5-step reversals. 



The iron was demagnetized and the field built up in one step : 



Amperemeter Reading. 

 1.220 



Ballistic Throw. 



20.76 



The iron was demagnetized and the field built up in two steps 



Amperemeter Reading. 

 0.641 

 1.221 



Ballistic Throw, 

 23.92 

 6.67 



The iron was demagnetized and the field built up in two steps : 



