106 



ADDITIONAL OBSERVATIONS OF THE 



Magnetic Dip at Hartford, Connecticut. Latitude 41° 46' N,; Longitude 4!i, 51m. fV. 

 Place of observation a short distance north-west of the State House. 



Date. 





Hour. 



Needle. 



No. 



Readings. 





Dip. 



1839, Sept. 



13th, 



9^— lU, A.M. 



No. 1, 





40 





78' 



' 58'.2 









No. 1, poles reversed, 





40 







52.4 









Mean of No. 1, 





80 







55.3 









No. 2, 





40 







61 .0 









No. 2, poles reversed, 





40 







60.8 









Mean of No. 2, 





80 







60.9 









Mean of both needles. 





160 





73 



58.1 



Magnetic Dip at Springfield, Massachusetts. Latitude 42° 6' N.; Longitude 8/i. 50m. W. 

 Place of observation a few rods east of Hampton Coffee House. 



Date. 

 1839, Sept. 14th, 



Hour. 



Needle. 



No 



Readings. 



E 



>ip. 



-10, A. M. 



No. 1, 





40 



74° 



7'. 6 





No. 1, poles reversed, 





40 





8 .1 





Mean of No. 1, 





80 





7.8 





No. 2, 





40 





7- .a 





No. 2, poles reversed, 





40 





5.0 





Mean of No. 2, 





80 





6.0 



(( 4.4 



Mean of both needles. 





160 



74 



6.9 



Mcignetic Dip at Longmeadotv, Massachusetts. Latitude 42° 2' N.; Longitude ih. 50m. W. 

 Place of observation a few rods west of the village church. 



Date. 

 1839, Sept. 14th, 



Hour. 

 3i— 5, P.M. 



Needle. 

 No. 1, 



No. 1, poles reversed, 

 Mean of No. 1, 

 No. 2, 



No. 2, poles reversed, 

 Mean of No. 2, 

 Mean of both needles. 



No. Readings. 

 40 

 40 

 80 

 40 

 40 

 80 

 160 



Dip. 



74° 6'. 4 



4.0 



5.2 



11 .7 



73 59.0 



74 5.4 

 74 5 .3 



