214 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



No figure is given for the results obtained on Novendber 6, 1906, and 

 collected in Table VI. The curves are very steep. 



See Figure 11 for the magnetization curves corresponding to Tables 

 VII and VIII, of November 16, 1906. The curves passing through the 

 crosses are the ones obtained by using the method of steps, while the 



TABLE IV. [Figure 8.] 



October 9, 1906. 



Diam. = 0.4763 cm, = 3/16 in. 



Reversals. 



ones through the dots were found by means of the reversal method. 

 The vertical arrow-points indicate the probable position of the normal 

 curve by steps, and the oblique arrows give the reversal one. Several 

 series of step curves were taken for each ni so that a good average 

 curve could be constructed. It will be noticed that the step curves 

 all lie below the others, except the one for in = 400. 



