194 Dr. C. Fromme on the Magnetism of Steel Bars, 



a'-V. 





a'-b'. 



103-5 





103-7 



103-75 





103-85 



103-9 





103-65 



103-8 





103-7 



103-7375 





103-725 



n = — 



-b 



2 



- =51-8656. 





Helix. 



b. a. 





b. a. 



739-0 783-2 





739-9 783-0 



739-3 783-0 





739-7 782-7 



739-1 783-3 





738-5 782-5 



738-9 783-0 





738-7 782-6 



739-1 783-0 





738-4 782-4 



738-9 782-8 





738-4 782-4 



a — b. 





a — b. 



44-05 





44-2 



44-05 





44-1 



44-0 





44-05 



44-0 





44-0 



22-025 





44-0875 



a 



—b 





n= - 



2~ 



= 22-0281. 



In the mean, n= 22-0547. 



Since the distance from mirror to scale was 



r = 3317*006 s cale-divisions, 



the angle could be calculated by the formula 



Hence 



. w 1 / 11 n z \ 



sm 2 = sr-32^> 



sin ^=0-00390877, 

 sin|=0-00166222, 



sin | -sin | = 0-00224655. 



G= 130218, 

 & =9-6467, 

 K=0-53107. 



