LIEUT. -COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
151 
N. by W. 
N.N.W. 
N.W. by N. 
N.W. 
N.W. by W. 
N.N.W. 
W. by N. 
•1905 - 
•3482 — 
•4481 - 
•4727 — 
•4193 - 
•2954 — 
•1212 — 
•2115 b — 
•3834 b = 
•4916 b = 
•5258 b = 
•4798 b = 
•3626 b = 
•1936 b = 
— 0*510 a 
— 1*001 a 
— 1*454 a 
— 1-850 a 
— 2*175 a 
— 2-417 a 
— 2’566 a 
+ 2-2954 — 
2 6483 b = 
— 11-973 a. 
W. by S. 
— -2689 + 
•1876 b = 
— 2*566 a 
w.s.w. 
- -4130 + 
•3423 b = 
— 2"417 a 
S.W. by W. 
— -5021 + 
•4427 b = 
- 2-175 a 
S.W. 
— -5233 -f- 
•4754 b = 
— 1*850 a 
S.W. by S. 
— -4729 + 
•4359 b — 
— 1*454 a 
s.s.w. 
— -3574 + 
•3301 b = 
— 1*001 a 
S. by W. 
- -1919 -f 
•1768 b = 
— 0‘510a 
- 2-7295 + 2-3908 b = 
— 11-973 a. 
S. by E. 
•1915 - 
•I860 b = 
0-510 a 
S.S.E. 
•3563 - 
•3366 b = 
1-001 a 
S.E. by S. 
•4693 — 
•4451 b = 
1-454 a 
S.E. 
•5161 - 
•4832 b = 
1-850 a 
S.E. by E. 
•4900 - 
•4489 b = 
2-175 a 
E.S.E. 
*3953 - 
•3459 b = 
2-417 a 
E. by S. 
•2462 - 
•1888 b = 
2-566 a 
+ 2-6647 - 
2-4345 b = 
11-973 a. 
E. by N. 
— -1088 -f- 
•1939 b = 
2*566 a 
E.N.E. 
- -2967 + 
•3625 b = 
2"417 a 
N.E. by E. 
— -4214 4- 
•4789 b = 
2-175 a 
N.E. 
— -4732 + 
•5252 b = 
1*850 a 
N.E. by N. 
- -4494 + 
•4888 b = 
1-454 a 
N.N.E. 
- -3492 + 
•3780 b — 
1-001 a 
N. byE. 
- -1908 + 
•2050 b = 
0-510 a 
- 2-2895 + 2-6323 b = 
11-973 a. 
r 
. . (i.) 
. ( 2 .) 
(3.) 
. . . . (4.) 
From (1.) and (4.), changing the signs of (1.) and summing, we have 
- 4-5849 + 5-2806 b = + 23'946 a (5.) 
From (2.) and (3.), changing the signs of (3.) and summing, we have 
— 5-3942 -j- 4-8253 6 =— 23-946 a ; 
whence 10"1059 b = -f- 9-9791 ; and b — + *9875 ; 
( 6 .) 
