MAGNETIC DIPS IN THE UNITED STATES. 



103 



last 160 observations of No. 2 is 72° 49'.6, and the mean of the 320 readings, 

 Aug. 16th— 19th, is 72° 48 '.4. 



Magnetic Dip at Buffalo, New York, Latitude 42° 53' N.; Longitude 5h. 16m. W. 

 Place of observation a few rods east of the American House. 



Date. 



Hour. 



Needle. 



No 



Readings. 





Dip. 



839, Aug. 31st, 



8—10, A. M. 



No. 1, 





40 





74° 36'.3 



.. .( it 





No. 1, poles reversed, 





40 







43.1 



a 





Mean of No. 1, 





80 







39.7 



ti 





No. 2, 





40 







37.4 



ii li it 





No. 2, poles reversed, 





40 







46.2 



it a a 





Mean of No. 2, 





80 







41 .8 



a 11 (( 





Mean of both needles. 





160 





74 



40.8 



Magnetic Dip at Oswego, New Fork. Latitude 43° 26' N; Longitude 5h. 6m. W. 

 Place of observation a few rods west of the village. 





Date. 





Hour. 



Needle. 



No 



Readings. 





Dip. 



331 



), Sept. 



1st, 



7i—9i, A. M. 



No. 1, 





40 





75' 



' 17'.3 



i.i 







" " 



No. 1, poles reversed. 





40 







4.8 



<■' 









Mean of No. 1, 





80 







11 .1 



ii 









No. 2, 





40 







13.2 



a 









No. 2, poles reversed. 





40 







9.7 



a 









Mean of No. 2, 





80 







11 .5 



a 









Mean of both needles, 





160 





75 



11 .3 



Magnetic Dip at Syracuse, New Fork. Latitude 43° 0' N.; Longitude 5h. 5m. W. 

 Place of observation a grove, a few rods north-east of the village. 



Date. 



Hour. 



Needle. 



No. 



Readings. 



Dip. 



1839, Sept. 2d, 



8—10, A. M. 



No. 1, 





40 



74° 47'. 8 







No. 1, poles reversed, 





40 



51 .6 







Mean of No. 1, 





80 



49.7 







No. 2, 





40 



50.2 







No. 2, poles reversed, 





40 



54.0 







Mean of No. 2, 





80 



52.1 







Mean of both needles, 





160 



74 50,9 



