MAGNETIC O B S E 11 V A T I N S . 



49 



Tors. cir. 



Scale 





Diff's. 



300 



3° 



2IO 

 300 



8o d .4 

 83.6 

 76.7 



80.4 



3 d - 2 

 6.9 



3-7 



Mean = v = 3.45 





Lo.s 



v = 9'.8 

 5400' + v' 

 5400 (ar.co.) 



!+ H - 



F 



3-733I8 

 6.26761 





0.00079 



1 4175 



•+4 



Sum 

 Tan u 



Tan u 

 r 3 



4 



m' 

 X? 

 m 

 X 



Log's. 



1.72876 

 79 



1.88107 

 6.46380 



8.34487 

 0.90309 

 9.69897 



8.94693 

 8.94861 



Horizontal Intensity. 



Observations of Deflections. 



Station, Acapulco, Mexico. Date, May 30th, 1866. Mag. C. 32 deflecting. Mag. S. 8 suspended. 



Observer, Win. Harkness. 



s 





 5 " 



Time. 

 A. M. 



h. m. 



Temp, 

 t 



Scale 

 Readings. 



Alternate 

 Means. 



Diff's. 



List. 





w. 



E. 

 W. 

 E. 



7 32 



84° 



66 J . 9 

 94.1 

 66.9 

 94.2 



66 d . 9 

 94.2 



2 7 d -3 



On 



ON 











II 





E. 



W. 

 E. 

 W. 



7 4° 



85 



94-4 

 66.8 

 94-4 

 66.8 



94-4 

 66.8 



27.6 



bo 

 O 









II 



Means, 





84-5 





2U d 



27-45 















¥= *'-4i 





Log's. 



2U 



3 



I-438S4 



°.I5I5 2 



79 



. H 

 I+ -F 



Sum 

 Tan it 



u' 

 Tanu 

 r 3 



i 

 2 



m' 



X 7 



i-59°85 

 6.46374 



8.05459 

 1. 19382 

 9.69897 



8.94738 















m 

 X" 



8.94846 



