96 
MR. AIRY ON THE OBSERVED DEVIATIONS OF THE COMPASS 
Table of Polar-Magnet-Deviations, 
Apparent Azimuth from Neutral 
Position 
in points and decimals. 
Modulus. 
•60 
•61 
•62 
•63 
•64 
•65 
•66 
•67 
•68 
•69 
•70 
Corresponding Polar-Magnet-Deviation, in degrees and minutes. 
+ 
+ 
— 
— 
P 
P 
P 
P 
o 
o 
o 
/ 
1 ° 
/ 
o 
/ 
O 
/ 
0 
/ 
O 
/ 
0 
o 
o 
0-0 
16-0 
16-0 
32-0 
0 
0 
0 
0 
0 
0 
i 0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0-1 
15-9 
16-1 
31-9 
0 
41 
0 
41 
0 
42 
0 
42 
0 
43 
0 
44 
0 
43 
0 
45 
0 
46 
0 
46 
0 
47 
0-2 
15-8 
16-2 
31-8 
1 
21 
1 
22 
] 
24 
1 
25 
1 
26 
1 
27 
1 
29 
1 
30 
1 
31 
1 
32 
1 
34 
0-3 
15-7 
16-3 
31-7 
2 
2 
O 
4 
2 
6 
2 
8 
O 
10 
2 
12 
2 
14 
2 
13 
2 
17 
2 
19 
2 
21 
0-4 
15-6 
16-4 
31-6 
2 
42 
2 
44 
2 
47 
2 
49 
2 
52 
2 
53 
2 
38 
3 
0 
3 
3 
3 
5 
3 
8 
0'5 
15-5 
16-5 
31-5 
3 
23 
3 
26 
3 
29 
3 
32 
3 
36 
3 
39 
3 
43 
3 
46 
3 
49 
3 
52 
3 
56 
0-6 
15-4 
16'6 
31-4 
4 
3 
4 
7 
4 
11 
4 
15 
4 
19 
4 
23 
4 
27 
4 
31 
4 
35 
4 
39 
4 
43 
0-7 
15-3 
16-7 
31-3 
4 
43 
4 
48 
4 
53 
4 
57 
5 
2 
5 
7 
5 
12 
3 
16 
5 
21 
5 
25 
5 
30 
0-8 
15-2 
16-8 
31-2 
5 
23 
5 
28 
5 
34 
3 
39 
5 
45 
5 
30 
5 
56 
6 
1 
6 
6 
6 
11 
6 
17 
0-9 
15-1 
16-9 
3 M 
6 
3 
6 
9 
6 
15 
6 
21 
6 
27 
6 
33 
6 
40 
6 
46 
6 
32 
6 
58 
7 
4 
1-0 
15-0 
17-0 
31-0 
6 
43 
6 
30 
6 
57 
7 
3 
7 
10 
7 
17 
7 
24 
7 
30 
7 
37 
7 
44 
7 
51 
M 
14-9 
17-1 
30-9 
7 
23 
7 
30 
7 
38 
7 
45 
7 
53 
8 
0 
8 
8 
8 
15 
8 
23 
8 
30 
8 
38 
1-2 
14-8 
17-2 
30-8 
8 
3 
8 
11 
8 
19 
8 
27 
8 
35 
8 
43 
8 
52 
9 
0 
9 
8 
9 
16 
9 
24 
1-3 
14-7 
17-3 
30-7 
8 
43 
8 
51 
9 
0 
9 
8 
9 
17 
9 
26 
9 
35 
9 
43 
9 
52 
10 
1 
10 
10 
1-4 
14-6 
17-4 
30-6 
9 
22 
9 
31 
9 
41 
9 
50 
10 
0 
10 
9 
10 
19 
10 
28 
10 
38 
10 
47 
10 
57 
1-5 
14-5 
17-5 
30-5 
10 
2 
10 
12 
10 
22 
10 
32 
10 
42 
10 
53 
11 
3 
11 
13 
11 
23 
11 
33 
11 
43 
1-6 
14-4 
17-6 
30-4 
10 
41 
10 
32 
11 
3 
11 
13 
11 
24 
11 
33 
11 
46 
11 
36 
12 
7 
12 
18 
12 
29 
1-7 
14-3 
17-7 
30-3 
11 
20 
11 
31 
11 
43 
11 
54 
i 2 
6 
12 
17 
12 
29 
12 
40 
12 
52 
13 
3 
13 
15 
1-8 
14-2 
17-8 
30-2 
11 
59 
12 
11 
12 
23 
12 
35 
12 
47 
12 
59 
13 
12 
13 
24 
13 
36 
13 
48 
14 
1 
1-9 
14-1 
17*9 
30-1 
12 
38 
12 
50 
13 
3 
13 
16 
13 
29 
13 
42 
13 
35 
14 
8 
14 
21 
14 
34 
14 
47 
2-0 
14-0 
18-0 
30-0 
13 
16 
13 
29 
13 
43 
13 
56 
14 
10 
14 
24 
14 
38 
14 
31 
13 
3 
13 
18 
13 
32 
2-1 
13-9 
18-1 
29-9 
13 
54 
14 
8 
14 
23 
14 
37 
14 
51 
15 
5 
15 
20 
15 
34 
15 
49 
16 
3 
16 
17 
2-2 
13-8 
18-2 
29-8 
14 
33 
14 
48 
15 
3 
15 
18 
15 
33 
15 
48 
16 
3 
16 
17 
16 
32 
16 
47 
17 
2 
2-3 
13-7 
18-3 
29-7 
15 
11 
15 
26 
15 
42 
15 
57 
16 
13 
16 
29 
16 
43 
17 
0 
17 
16 
17 
31 
17 
47 
2'4 
13-6 
18-4 
29-6 
13 
48 
16 
4 
16 
21 
16 
37 
16 
53 
17 
9 
17 
26 
17 
42 
17 
58 
18 
14 
18 
31 
2-5 
13'5 
18-5 
29-3 
16 
25 
16 
42 
17 
0 
17 
17 
17 
34 
17 
31 
18 
8 
18 
25 
18 
42 
18 
59 
19 
16 
2-6 
13-4 
18-6 
29-4 
17 
3 
17 
20 
17 
38 
17 
55 
18 
13 
18 
31 
18 
49 
19 
6 
19 
24 
19 
42 
20 
0 
2-7 
13-3 
18-7 
29-3 
17 
40 
17 
58 
18 
16 
18 
34 
18 
53 
19 
11 
19 
30 
19 
48 
20 
7 
20 
25 
20 
44 
2-8 
13-2 
18-8 
29-2 
18 
16 
18 
35 
18 
54 
19 
13 
19 
32 
19 
51 
20 
11 
20 
30 
20 
49 
21 
8 
21 
27 
2-9 
13-1 
18-9 
29-1 
18 
52 
19 
12 
19 
32 
19 
31 
20 
11 
20 
31 
20 
51 
21 
10 
21 
30 
21 
50 
22 
10 
3-0 
13-0 
19-0 
29-0 
19 
28 
19 
48 
20 
9 
20 
29 
20 
50 
21 
10 
21 
31 
21 
51 
22 
12 
22 
32 
22 
53 
3-1 
12-9 
19-1 
28-9 
20 
4 
21 
25 
20 
46 
21 
7 
21 
28 
21 
49 
22 
11 
22 
32 
22 
53 
23 
14 
23 
36 
.3-2 
12-8 
19-2 
28-8 
20 
39 
21 
0 
21 
22 
21 
44 
22 
6 
22 
28 
22 
50 
23 
12 
23 
34 
23 
56 
24 
18 
3-3 
12-7 
19-3 
28-7 
21 
14 
21 
36 
21 
58 
22 
20 
22 
43 
23 
6 
23 
29 
23 
51 
24 
14 
24 
37 
25 
0 
.3-4 
12-6 
19-4 
28-6 
21 
48 
22 
11 
22 
34 
22 
57 
23 
21 
23 
44 
24 
8 
24 
31 
24 
54 
25 
17 
25 
41 
3-5 
12-5 
19-5 
28-5 
22 
22 
22 
45 
23 
9 
23 
33 
23 
57 
24 
21 
24 
46 
25 
10 
25 
34 
23 
58 
26 
22 
3-6 
12-4 
19-6 
28-4 
22 
56 
23 
20 
23 
44 
24 
9 
24 
34 
24 
59 
25 
24 
25 
48 
26 
13 
26 
38 
27 
3 
3-7 
12-3 
19-7 
28-3 
23 
29 
23 
54 
24 
19 
24 
44 
25 
10 
23 
35 
26 
1 
26 
26 
26 
52 
27 
17 
27 43 
3-8 
12-2 
19-8 
28-2 
24 
2 
24 
27 
24 
53 
25 
19 
25 
45 
26 
11 
26 
38 
27 
4 
27 
30 
27 
36 
28 
22 
3-9 
12-1 
19-9 
28-1 
24 
34 
25 
0 
23 
27 
25 
53 
26 
20 
26 
47 
27 
14 
27 
40 
28 
7 
28 
34 
29 
1 
4-0 
12-0 
200 
28-0 
25 
6 
25 
33 
26 
0 
26 
28 
26 
55 
27 
22 
27 
30 
28 
17 
28 
45 
29 
12 
29 
40 
+ 
-P 
i 
