72 
MR. AIRY ON THE OBSERVED DEVIATIONS OF THE COMPASS 
26. 
27. 
Vulcan. 
Portsmouth. 
Simon’s Bay. 
1852, July. 
1853, February. 
+ 0° 
13' 
-1 
D g, 
•155 
•271 
15-’ 
•58 
15' 
•73 
Observed 
Observed 
deviation 
Residual 
deviation 
Residual 
uncor- 
error. 
uncor- 
error. 
rected. 
rected. 
— 0 45 
(-1 16) 
+ 3 20 
(+1 2.3) 
- 0 55 
+ 0 19 
+ 30 
+ 4 5 
— 1 5 
+ 1 51 
+ 20 
+ 6 3 
— 1 22 
+ 3 9 
+ 0 35 
+ 7 25 
— 1 40 
+ 4 19 
— 3 5 
+ 6 13 
- 3 22 
+ 3 49 
- 8 0 
+ 3 24 
— 5 4 
+ 3 5 
— 13 10 
-0 9 
- 6 46 
+ 2 0 
— 18 35 
— 4 30 
— 8 30 
( + 0 36) 
-17 49 
(-3 16). 
- 9 47 
-0 43 
— 16 40 
-2 15 
— 11 5 
— 2 23 
-15 15 
— 1 .35 
— 10 32 
— 2 32 
— 15 10 
— 2 51 
— 10 0 
-3 0 
— 14 20 
— 3 51 
— 8 50 
— 3 4 
— 12 55 
— 4 42 
— 7 40 
-3 23 
— 7 30 
— 1 56 
- 5 0 
— 2 20 
— 5 20 
-2 37 
— 2 20 
(— 1 23) 
+ 0 55 
( + 0 36) 
+ 1 25 
+ 0 37 
+ 4 35 
+ 1 14 
+ 5 10 
+ 2 40 
+ 8 10 
+ 1 51 
+ 7 20 
+ 3 15 
+ 12 30 
+ 3 24 
+ 9 30 
+ 4 0 
+ 14 35 
+ 3 1 
+ 10 5 
+ 3 20 
+ 16 55 
+ 3 15 
+ 10 40 
+ 2 57 
+ 20 30 
+ 5 13 
+ 9 55 
+ 1 35 
+ 17 50 
+ 1 29 
+ 9 10 
( + 0 30) 
+ 17 30 
( + 0 41) 
+ 7 40 
-0 58 
+ 16 30 
-0 11 
+ 6 10 
— 2 6 
+ 12 0 
— 3 56 
+ 4 40 
~2 54 
+ 10 25 
— 4 10 
+ 3 10 
— 3 24 
+ 8 30 
— 4 15 
+ 22 
— 3 18 
+ 6 50 
-3 39 
+ 0 55 
— 2 56 
+ 40 
—3 50 
+ 0 5 
-2 9 
+ 3 40 
-1 19 
+ 3 42 
o * 
+ 4 30 
— S 
29 
— 3 
57 
+ 3 41 
+ 3 53 
2 
33 
— 4 
16 
+ 3 36 
+ 4 9 
•158 
•277 
15 
'•62 
15 
’•76 
No. 
Ship’s name 
Place of observation 
Time of observation 
Index correction 
25. 
Trident. 
Rio Janeiro. 
1852, November. 
+ 0 ° 8 ' 
Approximate modulus 
Approx, starboard angle 
•216 
3P-22 
Observed 
deviation 
uiicor- 
rected. 
cS 
o 
rO 
■§ 
-(j 
P 
o / 
0 
- 1 0 
( + 0 59) 
1 
+ 20 
+ 1 35 
2 
+ 50 
+ 2 11 
3 
+ 8 30 
+ 3 24 
4 
+ 11 0 
+ 3 47 
5 
+ 13 0 
+ 3 59 
6 
+ 13 40 
+ 3 10 
7 — 
+ 13 20 
+ 1 47 
8 
+ 12 0 
(-0 12) 
9 
+ 11 0 
-1 19 
10 
+ 90 
— 2 58 
11 
+ 80 
-3 9 
12 
+ 6 30 
— 3 23 
13 
+ 40 
— 4 15 
14 
+ 3 10 
-3 8 
15 
+ 30 
-1 6 
16 
+ 1 20 
(-0 23) 
17 
0 0 
+ 0 41 
18 
- 0 24 
+ 2 41 
19 
— 2 20 
+ 3 2 
20 
- 4 0 
+ 3 29 
21 
- 6 0 
+ 3 17 
22 
— 7 40 
+ 3 6 
23 
- 9 40 
+ 2 9 
24 
— 11 20 
( + 1 8) 
25 
-13 20 
— 0 45 
26 
— 15 0 
— 2 46 
27 
— 15 0 
— 3 35 
28 
— 16 0 
— 5 51 
29 
— 12 0 
-3 29 
30 
-90 
— 2 26 
31 
-60 
— 1 38 
Residual 
error. 
Quadraiital coefficients 
Mean quadraiital coefficient 
True modulus 
True starboard angle 
+ 3 59 
-3 52 
+ 3 41 
-4 6 
+ 3 54 
•221 
3 P-29 
