50 



M A G X E TIC S U R V E Y ( ) F P E X X S V L V A X I A . 



1 [arrisbun 



Huntingdon 



I [omewood 



Johnson's Tavern 



[rwin's -Mill 



Ball imore 



Date 



July 25, is hi 



Jiilv 30, 1840 



Aug. 13, MH) 



Aug. 18, 1840 



Aug. 24, 1S40 



Aug. 27, 1840 



Cylinder 



.■i bai 



c 



i: 



c 

 B 



C 

 B 



(' 

 i: 



B 



I tbnerved time of 10 



■i ■ i Bdura 'l 

 ISO . 



:;i 833 

 37.150 



34.682 



37.042 



34.994 

 37.292 



34.332 

 36.596 



34.410 

 36.482 



36.342 



I lui- lime 



..flu fib as 



nt Philadelphia. 



Relative i 

 intensity, Phila- 

 delphia 1.1 ii 



:;i 192 

 36.780 



Mian 



34.500 

 36.783 



Mean 



34.521 

 36.792 



Mean 



34.528 

 36.795 



Mean 



34.537 

 36.798 



36.801 



0.9805 

 0.9802 



0.9803 



0.9896 

 0.9861 





0.9732 

 0.9733 



0.9732 



1.0114 

 1.0109 



1.0112 



1.0068 

 (1.117) 



1 . temp. 

 dunbtful. 



1.0252 



VYilliamsport 



Curwinsville 



Mercer 



Erie 



Ellicottville 



Batli 



Silver Lake 



MilCiril 



July 28, 1841 



Aug. 1, 1X41 



A ug. 5, 1 * 1 1 



Aug. 9, 1841 



Aug. 16, I s4 1 



Aug. L9, Is4l 



Aug. 23, is ii 



C 

 B 



C 

 B 



C 

 B 



(' 

 B 



C 



c 

 B 



\m 26, Mil (' 

 B 



35. 540 

 37.682 



35. 179 

 37 595 



35. 199 

 37.571 



36. 137 



4 1.035 



36.787 

 38.939 



3(1.031 

 30.315 



36.530 

 38.654 



36 582 

 38 738 



34.750 

 36.841 



Mian 



3 1 753 

 36.843 



Mean 



34.757 

 36.846 



Mean 



34.762 

 36.850 



34.700 

 36.854 



Mean 



31.772 

 36.856 



Mean 



34.778 

 36.858 



Mean 



34.781 

 36.860 



Mean 



0.9560 

 0.9559 



0.0500 



0.9595 



0.9604 



0.9600 



0.9586 

 0.9618 



0.9602 



0.9102 



(0.8004) 



'.'.■. ,-|. ■ I, in."' C' !■■■: 



ervations. 

 0.8933 

 0.8958 



0.8945 



0.8865 

 0.8788 



0.8826 



0.9064 

 9092 



0.9078 



0.0030 

 0.005 4 



0.9046 





