MAGNETICAL OBSERVATIONS. 



Zero point of the scale of the collimating magnet. 

 18,56. August 7. Declinometer. 



Chronometer. 



5h41m 



Scale D. 



Chronometer. 



68 6 

 68 6 

 68 8 



5h 52m 



6S.7 



Scale R. 



75.0 



74.9 

 75.0 



Chronometer. 



Scale D. 



b^bS" 



68.8 

 68.7 



68.6 



75.0 



68.7 



Zero point 71.8 on the scale. 



1 division of the scale = 2'.1. 



Absolute magnetic declination. Magnetical azimuth of the mark A. 



1856. August 7. Theodolite and declinometer. 



CIRCLE EAST. 



Object. 



Scale reading. 



Scale D 

 Qh 4m 



Mark A 



Mark A 



Scale D 



Qh 40m 



71.8 

 720 

 72.0 



71.9 



72.1 

 72.1 

 72.1 





72.1 



Circle readinff. 



CIRCLE WEST. 



Object. 



Scale reading. 



294° 38' 15" 

 38 15 

 37 30 



294 38 



62 17 30 



17 10 



16 30 



62 17 3 



62 23 30 



23 30 



23 



62 23 20 



294 43 45 



44 30 



43 40 



294 43 58 



Scale R 

 Q^ 27" 



Mark A 



72.1 

 72,1 

 71.9 



72.0 



Circle reading. 



294° 42' 30" 

 43 

 42 



294 42 30 



62 24 



23 50 



23 



62 23 37 



Mark A bears N. 52° 18' 53" W. 



Mark A bears N. 52° 20' 57" W. 

 • 20 38 

 Magnetical azimuth of mark A, N. 52° 19' 50" W. 



Horizontal intensity. Experiments of vibration. 



1855. August 7, A. M. Magnet D 3 suspended. 



