BABBITT. — THE VON WALTENHOFEN PHENOMENON. 259 



After 4.5 more cycles the two steps were repeated in the next half 

 cycle : 



Amperemeter Reading. Ballistic Throw. 



0.642 15.82 



1.223 5.98 



After 4.5 cycles the two steps were repeated in the next half cycle : 



Amperemeter Reading. Ballistic Throw. 



0.642 15.81 



1.223 5.90 



The iron was carried through 4.5 cycles ; the next half cycle was 

 treated as at first — one step used : 



Amperemeter Reading. Ballistic Throw. 



1.223 22.02 



The iron was carried through 4.5 cycles ; the one step was used 

 in the next half cycle : 



Amperemeter Reading. Ballistic Throw. 



1.223 22.00 



The iron was carried through 4.5 cycles ; the one step was used 

 in the next half cycle : 



Amperemeter Reading. Ballistic Throw. 



1.222 22.07 



The iron was carried through 4.5 cycles ; the one step was used 

 in the next half cycle : 



Amperemeter Reading. Ballistic Throw. 



1.223 22.11 



The average of all the 1-step processes except the first gives 22.01. 

 The calculated 1-step reversal for the first 2-step process is 22.05, for 

 the second 22.08, for the third 21.99. The average of these three is 

 22.04. This differs by three parts in 2200 from the average 1-step 

 process. Since the average error for the latter is five parts in 2200 and 

 for the former three parts in 2200, this difference is well within the 

 error arising from other sources, and within | per cent, it is safe to 

 say that one step and two yield the same results. It will be observed 

 that in the case of the two steps the dividing point was not the same 



