304 OBSERVATIONS OF THE MAGNETIC DIP IN THE UNITED STATES. 



Magnetic Dip at Clinton, Ohio. Latitude 40° 58' N.; Longitude 81° 40' W. 

 Place of observation near the canal lock. 



Date. Hour. Needle. No. Readings. Dip. 



1841, Oct. 12, 1—2, P.M. No. 1, 40 72° 43.2 



" " No. 1, poles reversed, 40 44 .7 



" " Mean of No. 1, 80 72 44.0 



Magnetic Dip at Tallmadge, Ohio. Latitude 41° 6' N.; Longitude 81° 27' W. 

 Place of observation twenty rods north of station April 26, 1841. 



Date. Hour. Needle. No. Readings. Dip. 



1841, Oct. 13, 11—12, M. No. 1, 40 72° 52'.2 



" " No. 1, poles reversed, 40 50.8 



" " Mean of No. 1, 80 72 51.5 



Magnetic Dip at Hudson, Ohio. Latitude 41° 15' iV.; Longitude 81° 27' fF. 

 Place of observation, magnetic block formerly used. 



Date. 



Hour. 



Needle. 



No. 



Readings. 





Dip. 



1841, Oct. 27, 



lOi— lU, A. M. 



No. 1, 





40 



72' 



' 46'.7 



tc 



(( 



No. 1, poles reversed, 





40 





55.0 



(( 



<< 



Mean of No. 1, 





80 





50.9 



Nov. 13, 



li__2i, P. M. 



No. 1, 





40 





43.3 



(< 



(( 



No. 1, poles reversed, 





40 





49.8 



<( 



(( 



Mean of No. 1, 





80 





46.5 



Mean of both sets of observations, 



, • . . 



, 



160 



72 



48.7 



