70 



OBSERVATIONS TO DETERMINE THE MAGNETIC DIP 



Magnetic Dip at Warren, Ohio. Latitude 41° 16' N.; Longitude 80° 49' W. 

 Place of observation a few rods east of the village. 





Date. 





Hour. 



Needle. 



No. 



Readings. 



Dip. 



1840, 



Sept. 



11th, 



12— U, P.M. 



No. 1, 





40 



72° 55'.2 







a 





No. 1, poles reversed, 





40 



59.9 







(( 





Mean of No. 1, 





80 



57.6 







(( 





No. 2, 





40 



73 4.2 







(( 





No. 2, poles reversed, 





40 



3.4 







(( 





Mean of No. 2, 





80 



3.8 







a 





Mean of both needles, 





160 



73 0.7 



Magnetic Lip at Cleveland, Ohio. Latitude 41° 30' N.; Longitude 81° 42' TF. 



Place of observation half a mile south of the American House. 





Date. 





Hour. 



Needle. 



No. 



Readings. 





Dip. 



1840 



, Sept. 



22d, 



2—4, 



P.M. 



No. 1, 





40 



73° 17'. 4 











(( 



No. 1, poles reversed, 





40 





16.0 











tc 



Mean of No. 1, 





80 





16.7 











<< 



No. 2, 





40 





7.0 











(( 



No. 2, poles reversed, 





40 





7.6 











(( 



Mean of No. 2, 





80 





7.3 











11 



Mean of both needles, 





160 



73 



12.0 



This result accords better with other observations than my former observa- 

 tion at this place, and is believed to represent more accurately the true dip. 



Magnetic Dip at Bedford, Ohio. Latitude 41° 24' N.; Longitude 81° 32' PF. 



Place of observation a quarter of a mile south of the village. 



Date. 





Hour. 



Needle. 



No. Readings. 





Dip. 



1840, Sept. 



23d, 



1—3, P. M. 



No. 1, 



40 



72= 



50'.6 



<( (( 







No. 1, poles reversed. 



40 





58.3 



(( << 







Mean of No. 1, 



80 





54.5 



U <( 







No. 2, 



40 





64.8 



. « (( 







No. 2, poles reversed. 



40 





58.5 



(( l( 







Mean of No. 2, 



80 





61.6 



(( l( 







Mean of both needles, 



160 



72 



58.1 



