272 
COMMANDER JOHNSON'S MAGNETIC EXPERIMENTS 
Table III. 
Repetition of Observations at A and B, showing the Discrepancies which occurred 
in the Deflections of the Horizontal Needle at that position. 
Deviatioi 
or local ai 
traction 
at B. 
9 20 
8 48 
8 40 
10 50 
9 40 
10 10 
10 30 
S 40 
6 30 » 
8 18 
9 10 
8 30 
5 40 
4 0-f- 
0 25- 
3 50 
:5 30 
'8 20 
12 10 
12 0 
14 30 
16 40 c 
16 40 
15 0 
13 0 
11 10 
5 20- 
1 0 + 
2 15 
6 30 
? 55 
7 2 
6 40 
Note. — Oct. 29. Moderate breezes and cloudy weather.— --Oct. 31. Moderate breezes from the east : hazy weather. 
Date. 
BE 
s a 
w e 
rC £ 
H 
True mag- 
netic direc- 
tion of 
vessel’s head. 
Simultaneous observations 
at X. 
Local at- 
traction 
at A. 
True magnetic 
bearing of cone 
of mountain. 
Bearings of the 
cone from A. 
Deviation or 
local attrac- 
tion at A. 
True magnetic 
bearing of 
Dicomede from 
B. 
Bearings of the 
cone of Dico- 
mede from B. 
Oct. 
29. 
29-9 
57 a 4 
Oct. 
30. 
30 
52 4 
Oct. 
31. 
30- 1 
50 4 
North. 
N. by E. 
N.N.E. 
N.E. by N. 
N.E. 
N.E. by E. 
E.N.E. 
E. bv N. 
East. 
E. by S. 
E.S.E. 
S.E. by E. 
S.E. 
S.E. bv S. 
S.S.E. 
S. by E. 
South. 
S. bv W. 
S.S.W. 
S.W. by S. 
S.W. d 
S.W. by W. 
w.s.w. 
W. by S. 
West. 
W. by N. 
W.N.W. 
N.W.byW. 
N.W. 
N.W. by N. 
N.N.W. 
N. by W. 
North. 
N. 65 30 E. 
65 25 
65 10 
64 45 
64 32 
64 13 
63 53 
63 35 
S. 76 
63 15 
63 7 
62 55 
62 45 
62 40 
62 37 
62 39 
62 35 
62 45 
63 30 
63 30 
63 45 
64 0 
64 28 
65 10 
65 45 
66 8 
66 15 
66 15 
66 30 
66 32 
66 30 
66 30 
66 15 
66 15 
0 W. 
75 50 
77 55 
75 30 
76 20 
74 50 
72 30 
72 30 
10 30 
10 25 
12 45 
10 45 
11 48 
10 37 
8 37 
8 55 
N. 64 50 E. 
72 0 
70 50 
70 0 
69 50 
68 40 
65 50 
63 10 
60 50 
8 45 
7 43 
7 5 
7 5 
6 0 
3 13 
0 31 + 
1 45- 
59 10 
55 0 
54 20 
51 40 
50 10 
54 40 
52 30 
52 20 
3 35 
8 30 
9 10 
12 5 
13 50 
9 48 
12 40 
13 35 
55 20 
58 20 
61 20 
66 0 
68 30 
72 0 
73 0 
71 50 
69 40 
10 48 
7 55 
4 55 
0 30- 
1 58+ 
5 30 
6 30 
5 35 
3 25 
N. 73 20 E. 
74 30 
73 20 
73 30 
74 30 
74 10 
72 30 
73 30 
8 30 
9 40 
8 30 
8 40 
9 40 
9 20 
7 40 
8 40 
N. 64 50 E. 
N. 74 10 E. 
73 30 
73 30 
75 40 
74 30 
75 0 
75 20 
74 30 
73 20 
72 55 
72 30 
71 10 
69 30 
67 0 
65 10 
62 20 
8 30 
8 5 
7 40 
6 20 
4 40 
2 10 
0 20 + 
2 30- 
71 20 b 
73 0 
74 0 
73 20 
70 30 
68 50 
64 25 
61 0 
60 10 
55 40 
54 40 
53 30 
g 
*c3 
— — — s 
3 
O 
s 
O 
o 
c 
__ o 
U 
4 40 
9 10 
10 10 
11 20 
B from X. 
N. 64 40 
65 10 
65 30 
59 20 
56 30 
52 40 
52 50 
50 20 
X from B. 
S. 48 0 W. 
48 30 
50 30 
65 
35 
52 
30 
65 
30 
54 
20 
65 
20 
60 
0 
65 
20 
66 
20 
65 
15 
67 
30 
65 
10 
71 
40 
65 
5 
73 
0 
64 
58 
72 
0 
65 
0 
71 
40 
Fires lighted. — Steam up. 
3 79° in engine-room. b Vessel’s head E. 2J° S. 
c The cone of the distant mountain here became obscured in mist, so that it was necessary to resort to simultaneous observations 
with the station X on the south-west side of Tarbert Bay, 
