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 +
•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 +
•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 +
•1939 b —
2-566 a
E.N.E.
— -2967 +
•3625 b =
2-417 a
N.E. by E.
- -4214 +
•4789 b =
2-175 a
N.E.
- -4732 +
•5252 b =
1-850 a
N.E. by N.
— -4494 +
•4888 b =
T454 a
N.N.E.
- -3492 +
•3780 b =
1-001 a
N. by E.
- -1908 +
•2050 b =
0-510 a
- 2*2895,+ 2-6323 b = 11-973 a .(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 + 4-8253 6 = — 23-946 a;.
whence 10-1059 b = + 9-9791; and b — + -9875 ;
( 6 .)