20 



MAii n k t i c s i' [i v ]■: v o r r e n x s v l v a ni a. 



Rochester, NY. — Mount Hope Cemetery, near large oak tree, S. 25° E. of obelisk monument 

 of Mrs. Mary Brooks. 



ii.it.'. 



Aug. 1 



Time. 



3" 14"' P.M. 



I 



No. 1 

 No. 3 



Dip. 



7-4° 41'.6 

 7 1 33.1 



Temp. Fahr. 



69°. 5 

 69.5 



Dip when loaded. 



15° 13'. 1 

 19 02.9 



Dip reduced. 



i 



74° 4:i'. 2 

 74 43.7 



n total 

 intensity. 



1.1199 

 1.1 145 



Mean . 



74 43.5 



1.1322 



Clear, wind N. W. 



Niagara Falls, N. Y. — On Goat Island, in hollow leading to the Biddle stairs, which bear 

 about N. 35° W., large bass-wood tree intervenes. 



Aug. 3 



Time. 



Needle. 



Temp. Fahr. 



ll h 30 m A.M. 

 38 P.M. 



Cylinder 

 Bar 



7'.) Ji 

 79.7 



No. of series. 



No. of 

 vibrations, 



500 



Time of 

 10 vibrations. 



Horizontal 



intensity 

 Phil. 1 0000 



37VJ70 



37 s .933 



0.8544 



obser's imper- 

 fect. 



Mean 



0.8544 



Time. 



Dip. 



Temp. Fahr. 



Dip when loaded. 



6 



Dip reduced. 



Relatl i 

 intensity. 



Ausr. 3 



3"13 m P. M. 



3 54 " 



No. 1 



No. 3 



74° 40'. 8 

 74 39.3 



80°.2 



14° 03'.8 

 17 59.1 



74° 4s'.4 

 74 49.3 



1.1119 

 1.1369 



Mean 



74 48.9 



1.1244 



Niagara Falls. — British side, opposite centre of American Fall, near to N. of large lime- 

 stone rock terminating in a bluff. 



Date. 



All''. 4 



1'' 12'" P.M. 



Needle. 



No. 1 

 No. 3 



Dip. 



Temp. Fahr. 



Dipwben loaded. 



74° 52'.0 

 74 42.7 



7'.) .n 



14° 21'.2 



is 15.2 



Dip reduced. 

 t 



74° 53'.6 



74 52.7 



Relative total 

 intensity. 



1.1127 

 1.1373 



Mean . 



74 53.2 1.1250 



Cloudy, cumulus, wind S. W. 



Magnetic Observatory, Toronto, Canada. 



A F- 1 



1 ■II., 1 " l\ M. 



2 16 " 



Neodle. 



Temp. Fahr. No. of series. No. of Timeof 



vibrations. 10 vibrations. 



Curr'd. 



( iylinder 

 Bar 



t i ; 

 79.0 



550 

 500 



38M12 



40.205 



38-.075 



40.116 



Horlwintal 



, , , t . , , - i t v 

 l*lii 1 1 0000. 



lists;; 

 0.8472 



Mean 



0.8478 



Cloudy, cumulus, wind S. E. 



