90 
MR. AIRY ON THE OBSERVED DEVIATIONS OF THE COMPASS 
Table of Polar-Magnet-Deviations, 
Apparent Azimuth from Neutral 
Position 
in points and decimals. 
+ 
+ 
- 
p 
P 
P 
0-0 
16-0 
16-0 
0-1 
15-9 
16-1 
0-2 
15-8 
16-2 
0-3 
15-7 
16-3 
0-4 
15-6 
16-4 
0-5 
15-5 
16-5 
0-6 
15*4 
16-6 
0-7 
15-3 
16-7 
0-8 
15-2 
l6-8 
0-9 
15T 
16-9 
1-0 
15-0 
17-0 
1-1 
14-9 
17-1 
1-2 
14-8 
17-2 
1-3 
14-7 
17-3 
1-4 
14*6 
17-4 
1-5 
14-5 
17-0 
1-6 
14-4 
17-6 
1-7 
14-3 
17-7 
1-8 
14-2 
17-8 
1-9 
14-1 
17-9 
2*0 
14-0 
18-0 
2-1 
13-9 
18-1 
2-2 
13-8 
18-2 
2-3 
13-7 
18-3 
2'4 
13-6 
18-4 
2*5 
13-5 
18-5 
2*6 
13-4 
18-6 
2*7 
1.3-3 
18-7 
2-8 
13-2 
18-8 
2-9 
13-1 
18-9 
3-0 
13-0 
19-0 
3-1 
12-9 
19-1 
3-2 
12-8 
19-2 
,3-3 
12-7 
19*3 
3-4 
12-6 
19-4 
3-.0 
12-.5 
19-5 
.3-6 
12-4 
19-G 
3-7 
12-3 
19-7 
.3-8 
12-2 
19-8 
3-9 
12-1 
19-9 
4-0 
12-0 
20-0 
+ 
+ 
p 
32-0 
31-9 
31-8 
31-7 
31-6 
31-5 
31-4 
31-3 
31-2 
3M 
31-0 
30-9 
30-8 
30-7 
30-6 
30-5 
30*4 
30-3 
30-2 
30T 
30-0 
29-9 
29-8 
29-7 
29-6 
29-5 
29-4 
29-3 
29-2 
29T 
29-0 
28-9 
28-8 
28-7 
28-6 
28-5 
28-4 
28-3 
28-2 
28-1 
28-0 
Modulus. 
•30 
•31 
•32 
•33 
•34 
•35 
•36 
'37 
•38 
•39 
•40 
Corresponding 
Polar-Magnet-Deviation, in degrees and minutes. 
O 
0 
/ 
o 
o 
/ 1 
/ 
o 
/ 
O 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
20 
0 
21 
0 
22 
0 
22 
0 
23 
0 
24 
0 
25 
0 
25 
0 
26 
0 
26 
0 
27 
0 
40 
0 
42 
0 
43 
0 
44 
0 
46 
0 
47 
0 
49 
0 
50 
0 
51 
0 
52 
0 
54 
1 
1 
1 
3 
1 
5 
1 
7 
1 
9 
1 
11 
1 
13 
1 
15 
1 
17 
1 
19 
1 
21 
1 
21 
1 
23 
1 
26 
1 
28 
1 
31 
1 
34 
1 
37 
1 
39 
1 
42 
1 
45 
1 
48 
1 
41 
1 
44 
1 
47 
1 
50 
1 
54 
1 
57 
2 
1 
2 
4 
2 
8 
2 
11 
o 
15 
O 
1 
2 
5 
2 
9 
2 
13 
2 
17 
2 
21 
O 
26 
2 
30 
2 
34 
2 
38 
2 
42 
C> 
21 
o 
25 
2 
30 
2 
35 
2 
40 
2 
45 
2 
50 
2 
55 
3 
0 
3 
4 
3 
9 
2 
41 
2 
46 
2 
52 
2 
57 
3 
3 
3 
8 
3 
14 
3 
19 
3 
25 
3 
30 
3 
36 
3 
1 
3 
7 
3 
13 
3 
19 
3 
25 
3 
31 
3 
38 
3 
44 
3 
50 
3 
56 
4 
3 
3 
21 
3 
28 
3 
35 
3 
41 
3 
48 
3 
55 
4 
2 
4 
8 
4 
15 
4 
22 
4 
29 
3 
41 
3 
48 
3 
56 
4 
3 
4 
11 
4 
18 
4 26 
4 
33 
4 
41 
4 
48 
4 
56 
4 
1 
4 
9 
4 
17 
4 
25 
4 
33 
4 
41 
4 
50 
4 
58 
5 
6 
5 
14 
5 
22 
4 
21 
4 
29 
4 
38 
4 
46 
4 
55 
5 
4 
5 
13 
5 
21 
5 
30 
5 
39 
5 
48 
4 
40 
4 
49 
4 
59 
5 
8 
5 .18 
5 
27 
5 
37 
5 
46 
5 
55 
6 
4 
6 
14 
5 
0 
5 
10 
5 
20 
5 
30 
5 
40 
5 
50 
6 
0 
6 
10 
6 
20 
6 
30 
6 
40 
5 
19 
5 
30 
5 
40 
5 
50 
6 
1 
6 
12 
6 
23 
6 
33 
6 
44 
6 
55 
7 
6 
3 
39 
5 
50 
6 
1 
6 
12 
6 
24 
6 
35 
6 
47 
6 
58 
7 
9 
7 20 
7 
32 
5 
58 
6 
10 
6 
22 
6 
34 
6 
46 
6 
58 
7 
10 
7 21 
7 33 
7 
45 
7 57 
6 
17 
6 
29 
6 
42 
6 
54 
7 
7 
7 20 
7 
33 
7 
45 
7 
58 
8 
10 
8 
23 
6 
36 
6 
49 
7 
2 
7 
15 
7 28 
7 
41 
7 
55 
8 
8 
8 
21 
8 
34 
8 
48 
6 
55 
7 
8 
7 
22 
7 
36 
7 50 
8 
4 
8 
18 
8 
31 
8 
45 
8 
59 
9 
13 
7 
13 
7 
27 
7 42 
7 
56 
8 
11 
8 
25 
8 
40 
8 
54 
9 
9 
9 
23 
9 
38 
7 
31 
7 
46 
8 
2 
8 
17 
8 
32 
8 
47 
9 
2 
9 
17 
9 
32 
9 
47 
10 
2 
7 
50 
8 
5 
8 
21 
8 
36 
8 
52 
9 
8 
9 
24 
9 
39 
9 
55 
10 
11 
10 27 
8 
8 
8 
24 
8 
41 
8 
57 
9 
14 
9 
30 
9 
47 
10 
3 
10 
19 
10 
35 
10 
52 
8 
26 
8 
43 
9 
0 
9 
17 
9 
34 
9 
51 
10 
8 
10 
25 
10 
42 
10 
59 
11 
16 
8 
44 
9 
1 
9 
19 
9 
36 
9 
54 
10 
12 
10 
30 
10 
47 
11 
5 
11 
22 
11 
40 
9 
1 
9 
19 
9 
37 
9 
55 
10 
13 
10 
32 
10 
50 
11 
8 
11 
26 
11 
44 
12 
3 
9 
19 
9 
37 
9 
56 
10 
15 
10 
34 
10 
53 
11 
12 
11 
30 
11 
49 
12 
8 
12 27 
9 
36 
9 
55 
10 
15 
10 
34 
10 
54 
11 
13 
11 
33 
11 
52 
12 
11 
12 
30 
12 
50 
9 
53 
10 
13 
10 
33 
10 
53 
11 
13 
11 
33 
1 1 
53 
12 
13 
12 
33 
12 
53 
13 
13 
10 
10 
10 
30 
10 
51 
11 
11 
11 
32 
11 
53 
12 
14 
12 
34 
12 
55 
13 
15 
13 
36 
|10 
26 
10 
47 
11 
9 
11 
30 
11 
51 
12 
12 
12 
34 
12 
55 
13 
16 
13 
37 
13 
58 
^ 10 
42 
11 
4 
11 
26 
11 
47 
12 
9 
12 
31 
12 
53 
13 
15 
13 
36 
13 
58 
14 
20 
!10 
38 
11 
20 
11 
43 
12 
5 
12 
28 
12 
50 
13 
13 
13 
35 
13 57 
14 
19 
14 
42 
111 
14 
11 
37 
12 
0 
12 
23 
12 
46 
13 
9 
13 
32 
13 
54 
14 
17 
14 
40 
15 
3 
11 
30 
11 
53 
12 
17 
12 
40 
13 
4 
13 
27 
13 
51 
14 
14 
14 37 
15 
0 
15 
24 
I 11 
45 
12 
9 
12 
33 
12 
57 
13 
21 
13 
45 
14 
9 
14 
33 
14 57 
15 
21 
15 
45 
12 
0 
12 
24 
12 
49 
13 
13 
13 
38 
14 
3 
14 
28 
14 
52 
15 
17 
15 
41 
l6 
6 
12 
15 
12 
40 
13 
5 
13 
30 
13 
55 
14 
20 
14 
45 
15 
10 
15 
36 
16 
1 
16 
26 
