M A G N E TIC STJ K V E V F I> E N X S Y L V A N I A 



Harrisburg, Pa. Opposite avenue, between Capitol and State-house to E., near centre of 



grass plot', say 100 feet from building. Clear, wind X. \V. 



Date. 



duly "J.". 



Temp. Fahr. ] No. of series. 



No. of 

 vibrations. 



Ti mo of 



10 vibrations. 



Cylinder 

 Bar 



75° 



70 



300 

 250 



34".860 

 37.220 



Horizontal 

 intensity 



I'l.ll. 1 .0000 



34".833 0.9805 

 37.150 0.9802 



Mean 



0.9803 



Needle. 



July 25 



No. 1 

 No. :; 



Dip. 



72° 27'.:i 

 72 17.3 



Temp. Fahr. Dip when loaded. Dip reduced. 

 6 J 



78° ! 2° 32'. 72° 22'. 



18 ! —0 13.9 7 2 24.0 



Relative total 

 Intensity. 



L.0341 



1.0477 



Mean 



72 23.8 ' 1.0412 



Duncan's Island, Pa.— About 15 miles north of Harrisburg. In field E. of barn, under large 

 walnut tree, 400 feet from X. E. end of barn. 



July 27 



No. 1 

 No. 3 



Dip. 



72° 36'.2 

 72 30.9 



Temp. Fahr. 



Dip when loaded. Dip reduced. 



e I' 



85°.5 



—3° 47'.0 

 — 0° 23.2 



72° 31'.8 

 72 38.2 



Relative total 

 intensity. 



L.0210 

 1.0455 



.Mean . 



72 35.0 



1.0362 



Lewistown,Pa.— Aeross creek to south of town, about loo yards to west of road, and along 

 a Btreel or road. 



i 



