HALL, ABERRATION CONSTANT. 



45 



MICROSCOPES 75° APART. 



December 12 



14.... 



15.... 

 January 7 



Mean 



15° 



+0.02" 

 0.56 

 0.72 

 0.91 



+0.56" 



30° 



+1.45" 

 1.48 

 1.35 

 1.38 



+1.41" 



60° 



+3.93" 

 4.27 

 4.10 

 4.27 



+4.14" 



75° 



+6.28" 

 6.58 

 6.05 

 5.95 



+6.21" 



105° 



6.97" 

 7.04 

 6.67 

 7.04 



+6.93" 



120° 



+ 6.17" 

 6.24 

 5.74 



5.80 



+5.99" 



150° 



+7.07" 

 7.47 

 7.60 

 7.40 



+7.38" 



165° 



+8.31" 

 7.68 

 8.18 

 7.81 



+7.99" 



Temp. 



33.2° 

 44 >0 

 47.7 

 32.4 



CIRCLE 180° FROM ITS FIRST POSITIONS. 



