MADE IN THE UNITED STATES. 321 



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



1841, Aug. 20, 9i-— 12, A. M. Observed dip, Poles direct, 71° 37'.58 71° 44'.82 



«' " " Poles reversed, 41 .45 35 .17 



Mean dip, 71 39 .51 71 40 .00 



Mean dip of both needles, 71 39,75 



RemarTiS. — Weather cloudy, moderate south-west wind. The temperature 

 during the observations from 87° to 95°. 



These observations were made in a pavilion, constructed, at my suggestion, 

 by the liberality of the Rev. Gentlemen of St. Mary's college. Observations 

 No. III., made in a different part of the garden, show that the brick wall, 

 which passes at the distance of seventy-eight feet from the pavilion, has no 

 appreciable effect upon the magnetic dip. 



XL Magnetic Dip at Albany, N. Y. Latitude 42° 39' 3" N.; Longitude 73° 44' 49" W. 



Place of observation out of the city, about half a mile west of the capitol, 

 south corner of the Cemetery, near the Orphan Asylum. 



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



1841, Aug. 29, 4— 6i, P. M. Observed dip, Poles direct, 74° 43'. 55 74° 39'.17 



'• " " Poles reversed, 41.60 35.37 



Mean dip, 74 42 .57 74 37 .27 



Mean dip of both needles, 74 39 .92 



Remarks. — Weather cloudy and sultry, drizzling towards the close of the 

 observations. The temperature during the observations from 77° to 73°. 



The needle No. 2, (after reversing the poles,) very sluggish, although care- 

 fully magnetized. 



XII. Magnetic Dip at Oswego, N. Y. Latitude 43° 28' N.; Longitude 76° 30' TV. 



Place of observation at Mr. G. H. Woodruff's garden, near the Baptist 

 Church, the eastern end of the part of the town situated on the right side of 

 Oswego River. 



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



1841, Sept. 1, Ift— 12i, A. M. Observed dip, Poles direct, 75° 7'.82 74° 59'. 12 



" " «« Poles reversed, 9 .87 75 15 .60 



Mean dip, 75 8 .84 75 7 .36 



Mean dip of both needles, 75 8 .10 



Remarks. — Sky clear, light north-west wind. The temperature during the 

 observations from 70° to 73°. . . 



