322 OBSERVATIONS OF THE MAGNETIC DIP 



XIII. Magnetic Dip at Niagara Falls, N. Y. side. Latitude 43° 2' N.; Longitude 79° 12' W. 



Place of observation on the skirt of the wood bordering on the Niagara 

 River, east of the town of Niagara, about three hundred yards south-east of 

 Cataract Hotel. 



Date. Hour. Needle No. 1. Needle No. 2. 



1841, Sept. 5, 9|— lU, A. M. Observed dip, Poles direct, 74° 51'.72 74° 53'. 05 



♦' " " Poles reversed, 49 .62 45 .80 



Mean dip, 74 50 .67 74 49 .42 



Mean dip of both needles, 74 50.04 



Remarks. — Weather fine, calm. The temperature during the observations 

 from 69° to 76°. 



XIV. Magnetic Dip at Niagara Falls, Canada side. 

 Place of observation in the meadow, about thirty yards west of Clifton House. 



Date. Hour. Needle No. 1. Needle No. 2. 



1841, Sept. 5, 3—6, P. M. Observed dip, Poles direct, 74° 56' .7 74° 46'.55 



" •' " Poles reversed, 56 .6 59.10 



Mean dip, 74 56 .65 74 52 .82 



Mean dip of both needles, 74 54.73 



RemarJcs. — Weather fine, light south wind. The temperature during the 

 observations from 70° to 73°. 



The two stations of this day at the Niagara Falls, one mile apart of each 

 other, the second nearly north-west of the first. 



XV. Magnetic Lip at Detroit, Michigan. Latitude 42° 19' N.; Longitude 83° 3' W. 



Place of observation at Judge E. Farnsworth's Orchard, Jefferson avenue, 

 upper end of the city. 



Date. Hour. Needle !!io. 1. Needle No. 2. 



1841, Sept. 10, 9i— lU, A. M. Observed dip, Poles direct, 73° 34'.60 

 " " Poles reversed, 30 .90 



Mean dip of No. 1, 73 32 .75 



Remarks. — Weather cloudy, south-west wind. The temperature during 

 the observations from 76° to 78°. 



The sudden arrival and departure of a steam-boat which I was expecting to 

 furnish me a passage for Makinag, did not allow me time to observe the dip 

 with needle No. 2. 



