248 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Average observed throw for reversal of current 7.16 is 16.78. The 

 average calculated throw for the reversal of the current 7.16 is 16.77. 

 These two values were so close that it was assumed that in this in- 

 stance there was no leakage. 



Data for Magnetization-Reversal Curve. 



24th 



13.67 



16.97 



All odd numbered reversals were 1-step reversals. 



The toroid was demagnetized and the galvanometer tested again. 



Test of Ballistic Galvanometer. 



Reading of 

 Am peremeter. 



7.18 



Throw on 

 Reversing Current. 



16.81 



Reading of 

 Amperemeter. 



7.18 



Throw on 

 Opening Circuit. 



8.35 



