MAGNETICAL OBSERVATIONS. 



33 



Zero point of the scale of the collimating magnet. 

 1856. December 11, A. M. Declinometer. 



Chronometer, 



9" aT"" 



D 



3Ieai 



Scale, 



74.7 

 71.6 

 74.6 



74.6 



Chronometer. 



4h 59r 



K 



Scale 



72.9 

 73.0 

 73.0 



73.0 



Chronometer. 



d" 



Scale. 



74.7 

 74.7 

 74.6 



74.7 



Chronometer. 





Scale. 



72.9 

 73.1 

 73.1 



73.0 



Zero point 73.8 on the scale. 



Absolute magnetic declination. Magnetical azimuth of the mark A. 



1856. December 11, A.M. Theodolite and declinometer. 



CIRCLE TO THE LEFT. 



Chroaometer. 



Mark A 

 Mark A 

 10 17 

 10 19 

 Mark A 



Scale. 



Circle reading. 



73.8 

 73.8 

 73,8 



79° 42'. 5 

 46.5 

 80 1.5 

 153 24 

 31 

 29 

 153 30.5 

 86 

 84 



79 51 

 64 



80 8.5 



79 51 

 54 



80 8 

 153 32 



38 

 35 



Mean. 



79° 50'.2 

 153 28.0 

 153 33.5 



79 57.8 

 , 79 57.7 

 1.53 35.0 



Blean 



1856. December 11, A. M. Theodolite and declinometer. 



CIRCLE TO THE RIGHT. 



Chronometer. 



Scale. 



Circle reading. 



10'' 23"' 

 Mark A 

 Mark A 

 10 30 



73.7 

 73.7 

 73 7 



73.9 

 74.0 

 74.0 



79" 39' 



42 



58 



153 21 



28 

 26 

 153 22 

 28.5 

 27 



79 42 

 43.5 



80 



Mean. 



79° 46'.3 

 153 25.0 

 153 25.8 



79 48.5 



Mean 



Bearing of A. 



N. 106° 22'. 2 W. 

 106 24.3 



100 



N. 106 23.1 W. 



Bearing of A. 



N. 100° 21'.3 W. 

 100 22.7 



N. 106 22.0 W. 



Magnetical azimuth of the mark A, N. 100° 22'.6 W. 



