20 
LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
Table V. (Continued.) 
Station. 
1840. 
Needle. Time. Therm. Corrected Time. 
Remarks. 
Martins Island (Mar- 
quesas 
Bow Island. 
January 25 . . 
January 27 . . 
January 25 . . 
January 27 . . 
January 25 . . 
January 27 . . 
February 6 
February 6 
February 22 
February 22 
February 25 
February 25 
February 26 
February 26 
February 26 
February 27 
February 27 
February 28 
February 29 
February 29 
March 20 and 
March 22 . . . 
March 22 . . ■ 
March 22 . . ■ 
March 22 . . ■ 
March 22 . . ■ 
March 22 . . • 
March 22 . . ■ 
March 22 . . ■ 
March 22 . ■ • 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22 . . . 
March 22. . . 
March 22 . . . 
21 
11 
11 
12 
12 
13 
13 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
7 
7 
7 
8 
8 
8 
8 
9 
9 
9 
11 
11 
11 
12 
12 
12 
13 
13 
13 
s 
477- 8 
478- 1 
406-9 
406-2 
397-7 
397-4 
484- 1 
483-6 
483-4 
483- 5 
485- 6 
485-8 
485-0 
485-3 
484- 9 
484-1 
484-0 
484-4 
483- 5 
482-8 
484- 3 
550- 7 
551- 1 
551-9 
480- 8 
482-6 
481- 5 
481- 2 
446-4 
446-6 
446-4 
482- 8 
483- 1 
482-6 
411-0 
411-1 
411-2 
402-2 
401-9 
401-8 
90 
88 
87 
88 
88 
88 
87 
87 
82 
89 
90 
90 
81 
88 
88 
85 
83 
86 
87 
81 
83 
7ST 
s) 
ll] 
79 
81 
86 
sn 
82 y 
87 J 
861 
87 > 
88 J 
87“ 
87 
85 
474-6 
403-6 
394-8 
480-5 
480- 1 
482-1 
481- 7 
480- 8 
479-8 
481- 4 
548-9 
479-4 
443-9 
479-5 
408-2 
399-1 
>480-9 
Village. 
Observatory. 
S.E. Cocoanut Grove. 
Chron. L. 5-3. 
West Cocoanut Grove. 
West Rock. 
Village. 
Mean of 22 sets, 
servatory. 
Ob- 
>Chron. G. 5-8. 
By means of the observations in the preceding- Table, we obtain the ratio of the 
horizontal intensity at each station to that at each of the others specified in the Table. 
The absolute horizontal intensity was nowhere observed, because Captain Belcher 
was not furnished with an instrument for the purpose, and no such instrument has 
yet been carried to any of the stations which he visited. For the purpose of express- 
ing the ratio determined by the observations, we may select any one of the stations 
as a base-station, and assign an arbitrary value for the horizontal intensity at that 
station. I have chosen Panama, and have made the horizontal intensity there 
= 1000, because that is the value w- T hich it bears at Panama in M. Gauss’s theo- 
retical map of this element *, and those who may desire it will thus be enabled to 
* Atlas des Erdmagnetismus nach den elementen der theorie entworfen, Plate XI. ; and Taylor’s Scientific 
Memoirs, vol. ii. Plate XXII. 
