190 L. M. Cheesman — Effect of Mechanical Hardening 



multiply formula (II) by —— -jdr and integrate the produ 

 with respect to r, from r=r' to r=r". We thus obtain, 



(in,. * =i ™ • 7 (a+J ).. l0g !^Sg: 



The value of ( — ) calculated by (III) for the magnetizing 



helix used was found to be 29'23, for 26=100. f 



(c.) Gal ' • 

 the magne 



deflected magnetometer needle was perp 

 their middle point, and hence the specif! 

 1 by the following formula : 



15. Experiments. 

 Wire 1 a. Hard. Subjected i 

 1 kgs. Length lOOr 



