220 Mr. G. M. Whipple on Temperature-correction [May 3, 





Mean value. 



Average difference 

 from mean. 



Maximum. 



Minimum. 



1 



4 



0-000161 

 0-00000048 



+ 0-000060 

 + 0-00000023 



0-000762 

 0-00000398 



0-000044 

 0-00000001 



Subdividing them into classes we have, for 







Class A. Solid cylinders. 20 magnets examined. 



u 

 q.' 



0-000178 

 0-00000057 



+ 0-000048 

 + 0-00000027 



0-000368 

 0-00000129 



0-000104 

 0-00000011 





Class B. 



Collimators. 46 magnets examined. 



i 



0-000161 

 0-00000043 



+ 0-000043 

 + 0-00000016 



0-000399 

 0-00000082 



0-000093 

 0-00000004 



Class 0. Bars. 7 magnets examined. 



<i 



0-000171 

 0-00000064 



+ 0-000068 



0-000286 



0-000103 



Class D. Dip-needles. 11 magnets examined. 





0-000073 

 0-00000023 



+ 0-000027 

 + 0-00000018 



0-000132 

 0-00000054 



0-000044 

 0-00000001 



Class D. (Between temperatures 10° and 60° F.) 



9. 



0-000095 



+ 0-000038 



0-000164 



0-000054 



