88 
MR. AIRY ON THE OBSERVED DEVIATIONS OF THE COMPASS 
Table of Polar-Magnet-Deviations, 
Apparent Azimuth from Neutral 
Position 
in points and decimals. 
Modulus. 
•20 
•21 
•22 
•23 
•24 
•25 
•26 
•27 
•28 
•29 
Corresponding Polar-Magnet-Deviation, in degrees and minutes. 
•30 
+ 
+ 
- 
- 
p 
P 
P 
P 
O 
o 
/ 
O 
/ 
0 
/ 
o 
/ 
0 
/ 
O 
/ 
o 
o 
/ 
O 
/ 
O 
/ 
0-0 
16-0 
16-0 
32-0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0-1 
15-9 
161 
31-9 
0 
14 
0 
15 
0 
15 
0 
16 
0 
16 
0 
17 
0 
18 
0 
19 
0 
19 
0 
20 
0 
20 
0-2 
15-8 
16-2 
31-8 
0 
27 
0 
29 
0 
30 
0 
31 
0 
32 
0 
34 
0 
35 
0 
36 
0 
37 
0 
39 
0 
40 
0-3 
15-7 
16-3 
31-7 
0 
41 
0 
43 
0 
45 
0 
47 
0 
49 
0 
51 
0 
53 
0 
55 
0 
57 
0 
59 
1 
1 
0-4 
15-6 
16-4 
31-6 
0 
54 
0 
57 
1 
0 
1 
3 
1 
5 
1 
8 
1 
11 
1 
14 
1 
16 
1 
19 
1 
21 
0-5 
15-5 
16-5 
31-5 
1 
8 
1 
11 
1 
14 
1 
18 
1 
21 
1 
25 
1 
28 
1 
31 
1 
34 
1 
38 
1 
41 
0-6 
15-4 
16-6 
31-4 
1 
21 
1 
25 
1 
29 
1 
33 
1 
37 
1 
41 
1 
45 
1 
49 
1 
53 
1 
57 
2 
1 
0-7 
15-3 
16-7 
31-3 
1 
35 
1 
40 
1 
44 
1 
49 
1 
53 
1 
58 
2 
3 
2 
8 
2 
12 
2 
17 
2 
21 
0-8 
15-2 
16-8 
31-2 
1 
48 
1 
54 
1 
59 
2 
4 
2 
9 
2 
15 
2 
20 
2 
25 
2 
30 
2 
36 
2 
41 
0-9 
15-1 
16-9 
31-1 
2 
1 
2 
7 
2 
13 
2 
19 
2 
25 
2 
31 
2 
37 
2 
43 
2 
49 
2 
55 
3 
1 
1-0 
15-0 
17*0 
31-0 
2 
14 
2 
21 
2 
27 
o 
34 
2 
41 
2 
48 
2 
54 
3 
1 
3 
7 
3 
14 
3 
21 
1-1 
14-9 
17'1 
30-9 
2 
28 
2 
35 
2 
42 
2 
50 
2 
57 
3 
5 
3 
12 
3 
19 
3 
26 
3 
34 
3 
41 
1-2 
14-8 
17-2 
30-8 
2 
41 
2 
49 
2 
57 
3 
5 
3 
13 
3 
21 
3 
29 
3 
37 
3 
45 
3 
53 
4 
1 
1-3 
14-7 
17-3 
30-7 
2 
54 
3 
3 
3 
11 
3 
20 
3 
28 
3 
37 
3 
46 
3 
55 
4 
3 
4 
12 
4 
21 
1-4 
14-6 
17-4 
30-6 
3 
7 
3 
17 
3 
26 
3 
35 
3 
44 
3 
54 
4 
3 
4 
12 
4 
21 
4 
31 
4 
40 
1-5 
14-5 
17-5 
30-5 
3 
20 
3 
30 
3 
40 
3 
50 
4 
0 
4 
10 
4 
20 
4 
30 
4 
40 
4 
50 
5 
0 
1-6 
14-4 
17-6 
30-4 
3 
33 
3 
44 
3 
54 
4 
5 
4 
15 
4 
26 
4 
37 
4 
48 
4 
58 
5 
9 
5 
19 
1-7 
14-3 
17*7 
30-3 
3 
46 
3 
57 
4 
8 
4 
20 
4 
31 
4 
43 
4 
54 
5 
5 
5 
16 
5 
28 
5 
39 
1-8 
14-2 
17*8 
30-2 
3 
58 
4 
10 
4 
22 
4 
34 
4 
46 
4 
58 
5 
10 
5 
22 
5 
34 
5 
46 
5 
58 
1-9 
14-1 
17*9 
30-1 
4 
10 
4 
23 
4 
36 
4 
49 
5 
1 
5 
14 
5 
27 
5 
40 
5 
52 
6 
5 
6 
17 
2-0 
14-0 
18-0 
30-0 
4 
23 
4 
37 
4 
50 
5 
3 
5 
16 
5 
30 
5 
43 
5 
56 
6 
9 
6 
23 
6 
36 
2-1 
13-9 
18-1 
29-9 
4 
35 
4 
49 
5 
3 
5 
17 
5 
31 
5 
45 
5 
59 
6 
13 
6 
27 
6 
41 
6 
55 
2-2 
13-8 
18-2 
29*8 
4 
48 
5 
3 
5 
17 
5 
32 
5 
46 
6 
1 
6 
15 
6 
30 
6 
44 
6 
59 
7 
13 
2-3 
13-7 
18-3 
29*7 
5 
0 
5 
15 
5 
30 
5 
45 
6 
0 
6 
16 
6 
31 
6 
46 
7 
1 
7 
16 
7 31 
2-4 
13-6 
18-4 
29*6 
5 
12 
5 
28 
5 
44 
6 
0 
6 
15 
6 
31 
6 
47 
7 
3 
7 
18 
7 
34 
7 
50 
2-5 
13-5 
18-3 
29*5 
5 
24 
5 
41 
5 
57 
6 
14 
6 
30 
6 
47 
7 
3 
7 
18 
7 
35 
7 52 
8 
8 
2-6 
13-4 
18-6 
29*4 
5 
36 
5 
53 
6 
10 
6 
27 
6 
44 
7 
1 
7 
18 
7 
35 
7 
52 
8 
9 
8 26 
2-7 
13-3 
18-7 
29-3 
5 
48 
6 
6 
6 
23 
6 
41 
6 
58 
7 
16 
7 
34 
7 
52 
8 
9 
8 27 
8 
44 
2-8 
13-2 
18-8 
29*2 
6 
0 
6 
18 
6 
36 
6 
54 
7 
12 
7 
31 
7 
49 
8 
7 
8 
25 
8 
43 
9 
1 
2-9 
13-1 
18-9 
29*1 
6 
12 
6 
31 
6 
49 
7 
8 
7 
26 
7 
45 
8 
4 
8 
23 
8 
41 
9 
0 
9 
19 
3-0 
13-0 
19*0 
29*0 
6 
23 
6 
43 
7 
2 
7 
21 
7 
40 
8 
0 
8 
19 
8 
38 
8 
57 
9 
17 
9 
36 
3-1 
12-9 
19*1 
28-9 
6 
34 
6 
54 
7 
14 
7 
34 
7 
54 
8 
14 
8 
34 
8 
54 
9 
13 
9 
33 
9 
53 
3-2 
12-8 
19*2 
28-8 
6 
45 
7 
6 
7 
26 
7 
47 
8 
7 
8 
28 
8 
48 
9 
9 
9 
29 
9 
50 
10 
10 
3-3 
12-7 
19*3 
28-7 
6 
56 
7 
17 
7 
38 
7 
59 
8 
20 
8 
41 
9 
2 
9 
23 
9 
44 
10 
5 
10 
26 
3-4 
12-6 
19-4 
28-6 
7 
7 
7 
28 
7 
50 
8 
12 
8 
33 
8 
55 
9 
16 
9 
38 
9 
59 
10 
21 
10 
42 
3-5 
12-5 
19*5 
28-5 
7 
18 
7 
40 
8 
2 
8 
24 
8 
46 
9 
8 
9 
30 
9 
52 
10 
14 
10 
36 
10 
58 
3-6 
12-4 
19-6 
28-4 
7 
28 
7 
51 
8 
13 
8 
36 
8 
58 
9 
21 
9 
44 
10 
7 
10 
29 
10 
52 
11 
14 
3-7 
12-3 
19*7 
28-3 
7 
38 
8 
1 
8 
24 
8 
47 
9 
10 
9 
34 
9 
57 
10 
20 
10 
43 
11 
7 
11 
30 
3-8 
12-2 
19-8 
28-2 
7 
48 
8 
12 
8 
35 
8 
59 
9 
22 
9 
46 
10 
10 
10 
34 
10 
57 
11 
21 
11 
45 
3-9 
12-1 
19*9 
28-1 
7 
58 
8 
22 
8 
46 
9 
10 
9 
34 
9 
59 
10 
23 
10 
47 
11 
11 
11 
36 
12 
0 
4-0 
12-0 
20-0 
28-0 
8 
8 
8 
33 
8 
57 
9 
22 
9 
46 
10 
11 
10 
36 
11 
1 
11 
25 
11 
50 
12 
15 
+ 
+ 
