MAGNETIC SURVEY OF WESTERN NEW YOHK. 



(PART OF CANADA. ALSO NEW JERSEY AND PENNSYLVANIA. J 



THIRD MAGNETIC TOUR OF 1843. 



Abstract of Results for Relative Intensity Km! Dip at 15 Stations, 



Girard College, Philadelphia. 



Time. 



Needle. 



Temp. Fahr. 



No. of series. 



So. of 

 vibrations 



Time of 

 10 vibrations. 



Corr'd. 





July 20 4":;?" P.M. 

 " " 6 27 " 



Cylinder 

 Bar 



79°.5 

 T2.6 



500 

 250 



35".080 

 36.968 



35-.045 

 36.914 



I 



1.0000 



Date 



Needle. 



July 20 i 7" P. M. 



N T 0. 1 

 No. 3 



Dip. 



71° 56'.2 



71 4 ■"'.:; 



Temp. Fahr. 



75°. 2 

 74.6 



75.8 

 73.3 



Dip wheu loaded. 



+ 0° 42'. 7 

 18 26.1 



+ 4 48.0 

 21 34.1 



Dip reduced. 



71° 57'. 8 



71 55.3 



Relative total 

 Intensity . 



1.1797 



1.207s 



Mean . 



71 50.5 1.193 



The smaller values of o refer to the old London weights ) 



. , „ „ „ • 1 l 1 ni ' ;ls ' nolo. 



" larger new pm weights ) 



For these observations see Vol. II. of Girard College Magnetic and Meteorological Obserya 

 tions, pp. 1537-38. 



Princeton, N. J. — Middle of the Held S. from college. 



Dip. 



July 21 



No. 1 

 No. 3 



72° 39'.2 

 7 2 25.8 



Temp Fahr. 



Dip when loaded. 







18° 25'. 2 

 22 03.9 



Dip reduced. 



Relative total 



intensity. 



Mean 



72 lo'.s 

 72 35.8 



72 38.3 



1.1689 

 1.2005 



1.1847 



( n ) 



