380 



Report of the Keiv Committee. 



a quarter of a mile north of the Observatory as a meridian mark, the 

 orientation of which, with respect to the Magnetometer, was determined 

 by the late Mr. Welsh, and has since been carefully verified. 



The observers' initials refer — W to Mr. Gr. M. Whipple, and T to Mr. 



Observations of Deflection for Absolute Measure of Horizontal Force. 





a. M. T. 



Distances 

 of 



Centres of 

 Magnets. 



Tempe- 

 rature. 



Observed 

 Deflection. 



m 



I^Og:^. 



A. 



Mean. 



Observer. 



1875. 



cl 



h 



m 



foot. 



o 



O ; /; 









26 



12 



31 P.M. 



1-0 



53-6 



15 45 39 





W. 







2 



17 „ 



1-3 

 1-0 



54-0 



7 6 25 

 15 44 38 



9'13461 



,, 

 )) 











1-3 





7 6 2 





)) 





23 



12 



32 P.M. 



1-0 



46-2 



15 44 58 





w. 







2 



27 „ 



1-3 

 1-0 



46-1 



7 6 6 

 15 44 47 



9- 1,3,39 5 



)J 

 J> 











1-3 





7 6 1 





)) 



December 



20 



12 



44 P.M. 



1-0 



49-4 



15 45 13 





w. 







2 



16 „ 



1-3 

 1-0 



49-0 



7 6 18 

 15 44 17 



9'13414 



„ 



1876. 









1-3 





7 5 51 





)> 





25 



12 



10 P.M. 



1-0 



40-3 



15 45 58 





w. 





2 



9 „ 



1-3 

 1-0 



42-4 



7 6 25 

 15 44 38 



9- 1.3.380 



„ 











1-3 





7 5 59 









23 



12 



34 P.M. 



1-0 



52-5 



15 44 28 





w. 





2 



5 „ 



1-3 

 1-0 



52-2 



7 5 54 

 15 44 42 



9-1,34,30 



„ 











1-3 





7 6 12 









27 



1 



10 P.M. 



1-0 



43-6 



15 48 20 





F. 







2 



38 „ 



1-3 

 1-0 



45-6 



7 7 35 

 15 47 17 



9-1 ,3590 



jj 



n 











1-3 





7 7 12 





j> 





25 



12 



57 P.M. 



1-0 



64-2 



15 43 7 





F. 





2 



43 „ 



1-3 

 1-0 



65-8 



7 5 18 

 15 42 21 



9-13431 



„ 











1-3 





7 5 4 







May 



26 



12 



53 P.M. 



1-0 



56-5 



15 42 52 





F. 





2 



29 , 



1-3 

 1-0 



56-6 



7 5 20 

 15 42 17 



9-1 3368 













1-3 





7 4 57 









27 



12 



33 P.M. 



1-0 



74-6 



15 40 12 





F. 







2 



46 „ 



1-3 

 1-0 



79-5 



7 4 



15 39 29 



9-1,3,383 



j> 











1-3 





7 3 38 





)) 





26 



12 



42 P.M. 



1-0 



79-8 



15 38 24 





F. 





2 



33 „ 



1-3 

 1-0 



83-1 



7 3 20 

 15 37 32 



9-13335 



)5 



1> 











1-3 





7 2 49 









28 



12 



27 P.M. 



1-0 



67-9 



15 40 42 





F. 







2 



27 „ 



1-3 

 1-0 



69-9 



7 4 21 

 15 40 53 



9-13368 



jj 

 j> 











1-3 





7 4 7 









26 



12 



22 P.M. 



1-0 



67-9 



15 41 





F. 





2 



33 „ 



1-3 

 1-0 



69-1 



7 4 33 

 15 40 45 



9-13371 













1-3 





7 4 5 







