196 



Magnetism of the United States and its Vicinity. 



Table III.— Continued 



> tat ion 



Pointe Tonne re, 

 Otter Island, 

 Michipicoton, 

 Gargantua, . 

 Pointe aux Crepe 

 Quebec, 

 Pointe aux Pins, 

 Three Rivers, 

 Little River, 

 Lac da Grand Vase, 

 Te^salon Point, 

 Lake Ni pissing, 

 Fort la Cloche, 

 Snake Island, 

 Pointe Bapteme, 

 Sorel, 



Lake Huron, 

 Ricolet Falls, 

 Ki ngsey, 

 Grand Calumet, 

 Pointe aux Chenes 

 La Combes, 



Montreal. 

 Point Aylmer, 

 Isle d'Urval, 

 Stanstead, . 



Penetanguishene 

 God eric h, 



Toronto, 



Niagara, 

 Port Sarnia, 

 Buffalo, 

 Albany, 



Detroit, 

 Cambridge. . 

 Amherstburg, 

 Providence, 

 West Point, 



JNew Haven, 

 Vew York, 

 Princeton, . 



Philadelphia, 

 Baltimore, . 



Washington, 



Latitude 



Longitude. 



Intensity. 



48° 1 9' N. 

 48 6 

 47 56 



47 3 7 

 46 58 



46 49 

 46 29 



46 19 



46 18 



46 18 



46 16 



46 i3 



46 7 

 46 7 

 46 6 

 46 2 

 46 o 

 45 5 7 

 45 48 

 45 45 

 45 3 7 

 45 32 



45 3o 



45 29 



45 24 



45 2 



44 4 



43 4 



43 3 



43 



42 58 



42 52 



42 39 



42 24 



42 22 



42 6 



4i 49 



4i a4 

 4i 18 

 4o 49 



4o 22 

 3 9 58 

 3 9 17 



38 53 



D.i! 



Remarks on the Preceding Observations. 



The preceding observations of dip combined with those pre- 

 viously made, enable us to draw the lines of equal dip for the 

 northern part of the United States in a verv satisfactory manner- 



The 



observations of Majo 



northeastern 



before 



of Prof. Locke supply the deficiency in the northwest quarter I 

 while those of Lieut. Lefroy extend over a large portion of the 

 British possessions on the north of us. Our knowledge of the 

 dip of the magnetic needle is therefore tolerably complete » 

 one-half of the United States j but with the exception of tn» 



