Wil. Table of the Computed and Observed Variations 
of the Magnetic Intensity at the Earth's Surface. 
By R. W. ROTHMAN, Esq. M.A. 
FELLOW OF TRINITY COLLEGE. 
Tue formula used in the computation is ./4—3 (sin. dip)’. 
Observed Computed 
Intensity. Intensity. 
1.0000 1.0000 
Differences. 
J. Carlos del 
Rio Negro 
Carichana. .. . en tea TION se 
Mexico . 2 Db. PRS 2290 
eel SAS Dae ats thOON Aa ee 
London Hie nlgen >) 1 7o 20 eae 
Christiana... . 1.4959 MiB aaa 
Arendahl.... NAO se 
.. 14941 SIG ee sk 
Hare Island. . 1.6939 1.9547 . 
Davis’s Straits. 1.6900 1.9584 ... 
Baffin’s Bay. . pine ore LOO8Sh AY eae cy ial: at: 
1.9743. 
1,6943 1.9751 
1.7383 1.9850 . . 
. 1.9866 . 
whl 04570 cris) 1.0484 ; 
5 
+. 
+ 
+. 
+. 
- ot. 
ah 
siete 
aps 
wah 5 
+. 
GP 
Nov. 10, 1825. 
