PEIRCE. — MAGNETIZATION IN IRON. 



141 



Exciting Field. 



Figure 8 shows the form of the curve obtained by plotting the reciprocal 

 of the susceptibility of soft iron against t le intensity of the exciting field. 

 The ratio of the abscissa of any point of the curve to the corresponding ordinate 

 is less than the final value of /, and the tangent of the angle which the tangent 

 to the curve makes with the ordinate axis is greater than this value except 

 for small values of H. 



Figure 9. This curve shows the results of observations made by DuBois 

 upon an ellipsoidal piece of soft iron 18 cms. long and 0.6 cms. in diameter at 

 the middle. 



