Local Attraction of the Steam-vessel Comet. ^9S 
Observations on the Reciprocal Bearings of the Compasses 
marked A and B. 
Direction of 
Ship’s Head, 
by Observa- 
tion from Af- 
ter-Compass 
A to Compass 
B. 
Bearing of Af- 
ter-Compass 
B from Com- 
pass A. 
Difference or Lo, 
cal Attraction 
at Compass A. 
Direction of 
Ship’s Head, 
by Observa- 
tion from Af- 
ter-Compass 
A to Compass 
B. 
Bearing of Af- 
ter-Compass 
A from Com- 
pass B, 
Difference or Lo- 
cal Attraction 
at Compass A. 
o / 
o y 
o / 
o / 
o / 
o / 
N. 3 0 E. 
S. 3 OW. 
0 0 
S. 0 20W. 
N. 0 10 E. 
— 0 10 
8 0 
7 40 
+ 0 20 
14 0 
15 5 
— i 5 
21 0 
18 40 
+ 2 20 
19 0 
21 40 
—2 40 
31 40 
29 20 
4-2 20 
40 0 
41 30 
— 1 30 
39 25 
38 0 
+ 1 25 
50 40 
48 0 
+ 2 40 
66 30 
62 40 
+ 3 50 
t4 20 
70 40 
+ 3 40 
74 0 
77 20 
—3 20 
82 40 
8 0 
+ 2 40 
80 40 
84 0 
—3 20 
S. 85 45 E. 
N. 89 40 W. 
+ 3 55 
N. 86 0 W. 
S. 83 10 E. 
—2 50 
79 40 
83 30 
+ 3 50 
80 20 
77 0 
—3 20 
69 25 
73 10 
+ 3 45 
71 0 
68 0 
—3 0 
63 1 
65 10 
+ 2 9 
61 0 
58 40 
—2 20 
48 0 j 
51 10 
+ 3 10 
53 0 
50 0 
-3 0 
41 20 
39 40 
—1 40 
31 30 
34 20 
+ 2 50 
32 40 
31 40 
—1 0 
17 30 
18 40 
+ 1 10 
22 40 
22 0 
—0 40 
10 0 
9 40 
+ 0 20 
9 40 
9 0 
— 0 40 
Here, as in the preceding case, the compass B w^as known to 
have little or no attraction from the iron ; therefore the above 
errors are principally due to the steering-compass A, or rather 
to its situation, for, as has been observed, the steering-compass 
was removed during these experiments^ and one of the azimuths 
set up in its place. 
On examining the above Table, it will appear, that, with the 
ship’s head to the east, the north end was repelled to the west, 
and with the head to the west, the north end passed to the east 
bf its true bearing, which shows that the result was either due 
to the superior action of the chimney, or to some iron abaft the 
wheel, being directly the reverse of what generally takes place 
in the usual order of vessels in these latitudes. Whether this is 
the case in all steam- vessels with iron chimneys, may be worth 
the inquiry of those engaged in the navigation of them, parti- 
cularly in those intended for sea-voyages. 
VOL.nXTT. no. APRIL 1825 . 
ti 
