PEIRCE. — DEMAGNETIZING FACTORS OF CYLINDRICAL RODS. 55 



induction, B, due to an increase of one unit in the exciting field, H, 

 in the metal; and of the fractional change in B due to a change in H 

 of one percent of its own value. These quantities are denoted by k, 

 X, Zf respectively. 



From the numbers in the last column of Table I, and those in the 

 second column of Table II, it is easy to compute the ratio of the 

 intensities of the magnetizing field {H') in the metal, and the external 

 exciting field (H), for different values of m. The results of this pro- 

 cedure for a/b = 30, a/b, = 50, and a/b =100, appear in Table III. 



