294 Variation and Dip of the Magnetic Needle. 



have been 43'' E. 1809. Other observations about the same time 

 made it 23' E. In 1694, the variation was 5° W. At Norfolk, 

 lat. 36<^ 5V, long. 76°, he found no variation in 1809. At Rich- 

 mond, lat. 37° 27', long. 77° 25V nearly 57' E. In 1728, on the 

 boundary between Virginia and North Carolina, lat. 36° 31', long. 

 76°, nearly, the variation was settled at 3° W. In 1732, at Cape 

 Henry, lat. 37°, long. 75^'^, the variation was 4° 40' W. 



Jonathan Price, of Newborn, N. C, lat. 35° 7'N., states the va- 

 riation of the needle to have been there, in 1796, 2° 40' E. ; in 

 1806, it was less than 2° E., and in 1809, he found it 1° 45' E. 



Jared Mansfield, Surveyor General of the United States, gives 

 the following observations : 



" S. E. corner of Wel'tern Reserve, lat. 41° N., 

 long. 80° 37' W., varic 



10 miles west on the same parallel of latitude, 

 20 " " " 

 33 " " " 

 43 (.' u u 

 57 u u u 



123 " " " 



In latitude 40° 55' and longitude 81° 48', 

 Marietta, lat. 39° 25', long. 81° 26' W. 

 Detroit, lat. 42° 30', long. 82° 56', 

 Rapids of the Miami, lat. 41° 30', long. 



83° 30', 

 Fort Defiance, lat. 41° 15', long. 84° 23', 

 Cincinnati, lat. 39° 7', long. 84° 27', 

 Month of Miami River, lat. 39° 8', long. 



84° 45', 

 Latitude 38° 45' N., longitude 85° 15' W., 

 Latitude 38° 10', longitude 86° 30', 

 Near the Falls of the Ohio, lat. 38° 20' N., 



long. 85° 40' W., 

 Yincennes, lat. 38° 42', long. 87° 20', 



11 miles north of the mouth of the Wabash 

 River, " 7 10 



Mouth of the Ohio River, lat. 37° 4', long. 



89° W., " 7 20 



Cahokia, III, lat. 38° 36', long. 90° 9', " 8 25 



