MAJOR SABINE ON TERRESTRIAL MAGNETISM. 
135 
the secular change, the south dip increases in five or six years from a half to three 
quarters of a degree. A discrepancy to this amount in that quarter has been allowed 
for in tracing the isoclinal lines in the map. The Table in the Appendix (B.) contains 
an abstract of the corrected dip and time of horizontal vibration corresponding to the 
several geographical positions, taken from Mr. Dunlop’s Memoir : the final column 
has been computed by myself, employing as a basis the observations at Makerstown 
and Paramatta as above stated, with the intensity at Makerstown = T400. 
Mr. Dunlop’s results are distinguished in the maps of the Atlantic by inclined 
figures placed on the left side of the station mark. 
The results of the dip observations made on land are characterized by upright 
figures ; the particulars concerning them are contained in the following Table and 
its references. In cases where two or more observers have obtained results at the 
same station, the mean of their results has been inserted in the map. 
North and South America. 
Reference. 
Station. 
(a) 
Montreal 
(c) 
Oswego 
(b) 
Halifax 
( a ) 
Halifax 
( C ) 
Utica 
(c) 
Syracuse 
(c) 
Albany 
(c) 
Albanv 
(c) 
Buffalo 
(c) 
Schenectady 
(a) 
Drummondville 
( c ) 
Worcester 
(c) 
Cambridge 
(C) 
Springfield 
14 
Springfield 
(c) 
Longmeadow 
(c) 
Providence 
(c) 
Providence 
(c) 
Hartford 
h) 
Westpoint 
(o) 
Westpoint 
(c) 
New Plaven 
(c) 
New York 
(c) 
New York 
(c) 
Hudson 
(c) 
Princeton 
(c) 
Beaver 
(c) 
Pittsburgh 
(<0 
Philadelphia 
(c) 
Philadelphia 
(d) 
Urban a 
(d 
Springfield 
(d) 
Dayton 
( e ) 
Washington 
(d) 
Charlottesville 
(d) 
Columbus 
Latitude. 
Longitude. 
Dip. 
Observer. 
Year. 
45 27 
43 26 
44 39 
44 39 
43 09 
43 00 
42 39 
42 39 
42 53 
42 48 
43 04 
42 16 
42 22 
42 06 
42 06 
42 02 
41 
41 
41 
41 
41 
41 
49 
49 
46 
25 
25 
18 
40 43 
40 43 
41 15 
40 22 
40 44 
40 32 
39 57 
39 57 
40 03 
39 53 
39 45 
38 53 
38 02 
39 55 
286 30 
283 30 
296 23 
296 23 
284 45 
283 45 
286 15 
286 15 
281 00 
286 00 
280 49 
288 15 
289 00 
287 24 
287 24 
287 30 
288 35 
288 35 
287 15 
285 59 
285 59 
287 00 
285 59 
285 59 
279 45 
285 30 
279 30 
280 00 
284 48 
284 48 
276 18 
276 13 
275 51 
283 00 
281 29 
276 57 
+ 76 19 
+ 75 11 
+ 75 15 
+ 74 45 
+ 74 57 
+ 74 51 
+ 74 40 
+ 74 51 
+ 74 41 
+ 74 36 
+ 74 33 
+ 74 21 
+ 74 20 
+ 74 11 
+ 74 07 
+ 74 05 
+ 74 03 
+ 74 00 
-f 73 58 
+ 73 37 
+ 73 27 
+ 73 27 
+ 72 52 
-|- 72 52 
+ 72 47 
+ 72 47 
+ 72 40 
+ 72 39 
+ 72 00 
2 07 
71 39 
71 29 
+ 
+ 
+ 
+ 71 23 
•f 71 21 
+ 71 09 
+ 71 05 
Estcourt . , 
Loomis. . . 
Home 
Estcourt . 
Loomis. . . 
Loomis. . . 
Bache . . . . 
Loomis. . . 
Loomis. . . . 
Loomis. . . . 
Estcourt . . 
Loomis. . . . 
Loomis. . . . 
Bache . . . 
Loomis. . . , 
Loomis. . . . 
Bache 
Loomis. . . , 
Loomis. . . , 
Courtenay 
Loomis. . . 
Loomis. . . . 
Bache 
Loomis. . . . 
Loomis. . . 
Loomis. . . , 
Loomis. . . . 
Loomis. . . 
Bache . . . 
Loomis. . . 
Locke . . . . 
Locke . . . 
Locke 
Loomis. . . . 
Patterson . 
Locke . . . 
1838 
1839 
1834 
1838 
1839 
1839 
1834 
1839 
1839 
1839 
3 838 
1839 
1839 
1834 
1839 
1839 
1834 
1839 
1839 
1834 
1839 
1839 
1834 
1839 
1839 
1839 
1839 
1839 
1834 
1839 
1838 
1838 
1838 
1839 
1834 
1838 
