434 Magnetic Cliange of Length and Resistance in Nickel. 



length in millionths of the length o£ the wire, and the adja- 

 cent columns headed dR give the change of resistance for 

 the same loads, the numbers of Table. 1. being multiplied by 

 a factor, as shown in the table. This factor is chosen so as 

 to bring both changes into agreement for a field of about 

 300. These results are plotted graphically in fig. 2. The 



Fie. 2. 



45 



40 



35 



30 



25 



eo 

















„- 



■ 































&£ 



r**^ 

















^^ 



\0°^ 





/ 





























s'/ 





j;^*^ 



' 





ai 



in 6 







'/ 



>^ 



4& 



/S 





— A 



10 





// 



„**' 









<r 









/ / / 





, 



/ 



s& 



/ 







// 



' /X 





y 





/ / 









// 



// 





// 





/ 































































■ / // 









/ / 









/ 







// 





/' 









/ / 



/ / 





'' / 



// 











./ / 



• / 



/ 





/'' 











1 f / 





/ / 





S 











'/If 





/ / 



,' 













if'/ 





' / 



/ t 



















' / 













' 1 1 / 



f 





/ / 



CH 



4A'G£ Of I 



€A/GTH SH 



1MV 





If 



/ / 



, 



' 7 





BY FULL 



LINES. 





/ 



' / 



/ / 



,' 





/fa 



/stance s 



y DOTTED 



LI/VES 





















; / 







,' / 













/ // / 



/ 



' 



■' / 













/A/ 



/ / 



,' 







f?ESI 



DUAL 50 



/?£, 



DISTANCE 



; / / 



- J '-"/~ 



-; p^~ 

















'/ / «• 



"-/ / ,. 



S* 





























xl£A 



<GTH 



'//' *'- 



/ *' -^ 

















■^r< 













Fl 



ELD-H- 



?50 



300 



350 



45a 



full lines represent the change of length and the dotted lines 

 the change of resistance. The two residual curves are given 

 for a load of 50, and are on the same scale as the correspond- 

 ing curves for the total effect. 



It will be seen from the diagram that for the loads 50, 

 100, and 500 the two sets of curves Aery nearly coincide, and 

 that the discrepancy between them may be regarded as arising 

 almost wholly near the origin. The residual change of resist- 

 ance is considerably greater than the residual cliange of length, 

 but the general shape of the curves is the same in both cases. 



