IN WOOD-BUILT AND IRON-BUILT SHIPS 
67 
i No. 
5. 
6 . 
7 . 
8 . 
Ship’s name 
Erebus. 
Bloodhound. 
Place of observation 
Kerguelen’s Land. 
Plymouth. 
Constantinople. 
Piraeus. j 
Time of observation 
1 1845. 
1846. 
Index correction 
0° 
0' 
-0° 
27' 
-0° 6' 
— 0 
9' 
Approximate modulus 
•067 
•259 
•185 
•I6l 
Approx, starboard angle ... 
15'’-81 
31'’-15 
30'’-91 
30" 
•70 
Observed 
deviation 
uncor- 
rected. 
Residual 
error. 
Observed 
deviation 
uncor- 
rected. 
Residual 
error. 
Observed 
deviation 
uncor- 
rected. 
Residual 
error. 
Observed 
deviation 
u 11 cor- 
rected. 
Residual 
error. 
P 
r 0 
O 
+ 0 
8 
( 0 
0) 
i 
o 
— ] 
0 
O 
( + 1 
0) 
— 4 
20 
o 
(-2 
10) 

0 
1 
45 
( + 0 26 ) 
1 
— 0 
22 
+ 0 
15 
+ 3 
20 
+ 2 
26 
+ 0 
20 
+ 0 
26 
+ 
0 
15 
+ 0 
39 
2 
— 1 
1 
+ 0 
20 
+ 7 
15 
+ 3 
28 
+ 4 
0 
+ 2 
1 
+ 
2 
55 
+ 1 
30 
3 
— 1 
31 
+0 
31 
: +10 
50 
+ 4 
18 
+ 7 
0 
+ 3 
1 
+ 
7 
15 
+ 4 
4 ! 
4 
— 2 
9 
+ 0 
29 
i + 13 
20 
+ 4 
15 
+ 9 
0 
+ 3 
9 
+ 
8 
35 
+ 3 
46 
5 
— 2 
13 
+ 0 
54 
: + 14 
40 
+ 3 
22 
+ 10 
20 
+ 2 
50 
+ 10 
20 
+ 4 
3 
6 
— 3 
1 
+ 0 
30 
-1-15 
0 
+ 1 
53 
+ 11 
20 
+ 2 
29 
+ 11 
0 
+ 3 
30 
7 
— 3 
31 
+ 0 
14 
+ 15 
0 
+ 0 
33 
+ 11 
50 
+ 1 
55 
+ 
9 
55 
+ 1 
26 
8 
— 3 
48 
( + 0 
3) 
+ 14 
0 
(-1 
14) 
-f 12 
50 
( + 2 
17) 
+ 
9 
15 
( + 0 
9) 
9 
-3 
53 
— 0 
4 
+ 13 
20 
— 2 
6 
+ 10 
30 
-0 
17 
+ 
8 
5 
— 1 
17 1 
o 
10 
— 4 
12 
— 0 
35 
+ 11 
50 
— 3 
13 
+ 9 
0 
— 1 
39 
+ 
6 
35 
-2 
44 
x/x 
11 
-3 
51 
— 0 
33 
+ 10 
20 
— 3 
47 
+ 6 
50 
-3 
13 
+ 
5 
35 
— 3 
19 
12 
— 3 
20 
-0 
30 
+ 9 
20 
-3 
17 
+ 5 
30 
-3 
35 
+ 
4 
15 
-3 
52 
13 
-2 
50 
-0 
34 
+ 7 
50 
— 2 
50 
+ 3 
0 
— 4 
47 
+ 
3 
15 
-3 
48 
O 
14 
-2 
4 
-0 
28 
+ 6 
20 
— 2 
1 
+ 2 
50 
— 3 
20 
+ 
2 
55 
-2 
48 
15 
— 1 
10 
— 0 
16 
+ 4 
20 
— 1 
23 
+ 2 
40 
— 1 
41 
+ 
2 
35 
— 1 
35 
a 
16 
-0 
21 
(-0 
13) 
+ 2 
40 
(-0 
14) 
+ 2 
20 
(-0 
2) 
+ 
2 
45 
( + 0 
16) 
17 
+ 0 
44 
+ 0 
7 
+ 1 
20 
+ 1 
20 
+ 1 
30 
+ 1 
12 
+ 
1 
15 
+0 
33 
18 
+ 1 
53 
+ 0 
32 
— 0 
50 
+ 2 
3 
+ 0 
40 
+ 2 
27 
+ 
1 
25 
-1-2 
32 
19 
+ 2 
33 
+ 0 
31 
— 2 
40 
+ 2 
58 
- 0 
10 
+ 3 
37 
+ 
1 
35 
+ 4 
28 
u 
20 
+ 3 
23 
+ 0 
45 
— 5 
20 
+ 2 
51 
— 2 
40 
+ 2 
59 
— 
0 
5 
+ 4 
26 1 
Ph 
P4 
21 
+ 3 
46 
+ 0 
39 
- 7 
10 
+ 3 
14 
— 4 
0 
+ 3 
18 
— 
1 
55 
+ 4 
4 1 
22 
+ 4 
5 
+ 0 
34 
- 9 
50 
+ 2 
23 
- 6 
0 
+ 2 
39 
— 
3 
45 
+ 3 
27 
23 
+ 3 
56 
+ 0 
11 
— 11 
10 
+ 2 
23 
- 7 
30 
+ 2 
13 
— 
7 
5 
+ 1 
6 i 
24 
+ 3 
40 
(-0 
11) 
— 13 
0 
(' +1 
20) 
-10 
0 
(+0 21) 
— 
9 
5 
(-0 
17): 
25 
+ 3 
35 
-0 
14 
— 15 
50 
— 1 
18 
— 11 
20 
— 0 
45 
— 
11 
45 
— 2 
41 
26 
+ 3 
11 
-0 
26 
-16 
40 
— 2 
31 
— 12 
30 
2 
3 
— 
13 
5 
-4 
4 I 
27 
+ 2 
37 
-0 
41 
-16 
40 
— 3 
27 
— 11 
20 
—1 
29 
— 
12 
25 
— 3 
49 ' 
28 
+ 2 
1 
-0 
49 
— 15 
30 
— 3 
47 
-12 
30 
— 3 
37 
— 
10 
45 
-2 
56 ' 
29 
+ 2 
7 
— 0 
9 
— 13 
30 
— 3 
44 
— 11 
0 
-3 
25 
— 
9 
30 
— 2 
45 
30 
+ 1 
9 
-0 
27 
— 11 
20 
— 3 
53 
— 8 
30 
— 2 
32 
— 
8 
45 
— 3 
20 
31 
+ 0 
26 
— 0 
28 
- 6 
0 
— 1 
11 
- 6 
20 
— 2 
11 
— 
5 
0 
— 1 
8 
Quadrantal coefficients "‘*1^ 
o 
+ 0 
— 0 
+ 0 
-0 
39 
36 
40 
39 
O 
+ 4 
-3 
+ 3 
-3 
3 
43 
26 
58 
o 
+ 3 
— 3 
+ 3 
— 3 
10 
42 
41 
16 
o 
+ 3 
— 3 
+ 4 
— 4 
48 
53 
7 
9 
i 
Mean quadrantal coefficient 
+ 0 
38 
+ 3 
48 
+ 3 27 
+ 3 59 
True modulus 
•068 
•264 
•189 
•164 
True starboard angle 
15'’ 
•82 
31‘’-22 
30" 
99 
30"-82 1 
1 
