GANNETT.] 
GEOGRAPHIC TABLES AND FORMULAS. 
241 
APPROXIMATE SPHERICAL EXCESS. 
This may be obtained by dividing the area of the triangle in square 
miles by 75.5. 
Table 22. — Mean refraction. 
o / 
00 
Refraction. 
9} 2 
Refraction. 
Refraction. 
Refraction. 
Refrac- 
-tioii. 
34 54. 1 
n 
124.9 
116.9 
108.8 
100.8 
92.9 
85.2 
77.9 
71.1 
64.7 
59.0 
53.9 
•19.1 
45.6 
42.3 
39.8 
37.5 
35.6 
33.2 
30.9 
28.7 
26.7 
24. G 
23.0 
21.8 
20.6 
19.7 
19.0 
18.4 
17.9 
16.8 
15.6 
14.9 
11.1 
13.5 
12.8 
12.3 
11.7 
11.3 
10.8 
10.3 
10.0 
9.5 
o / 
70 
7 10.7 
7 L0.5 
9.2 
8.8 
8.4 
8.2 
7.9 
7.6 
7.3 
7.1 
6.8 
6.6 
6.4 
6.1 
6.0 
5.7 
5.6 
5.5 
5.2 
5.1 
5.0 
4.8 
4.7 
1 -, 
O 1 
14 
3 47.4 
// 
5.3 
5.1 
4.9 
4.7 
4.5 
4.3 
1.1 
4.0 
3.9 
3.6 
3.5 
:;.:; 
3.2 
3.2 
3.0 
2.9 
2.9 
2.8 
2.6 
2.6 
2.5 
2.5 
2.1 
2.3 
2.2 
2.2 
2.2 
2.1 
2.0 
1.9 
!.'.! 
1.9 
1.8 
1.8 
1.8 
1.7 
1.7 
1.6 
1.6 
1.5 
1.5 
o / 
28 
/ // 
1 48.2 
// 
1.5 
1.4 
1.5 
1.4 
1.4 
1.3 
1.3 
1.3 
1.3 
1.3 
1.2 
1.2 
o 
42 
43 
ii 
64.0 
61.8 
II 
2.2 
2.1 
2.0 
2.0 
1.9 
1.9 
1.7 
1.8 
1.7 
1.6 
1.6 
1.6 
1.5 
1.5 
1.1 
1.4 
1.1 
1.4 
1.3 
1.3 
1.3 
1.2 
1.3 
1.2 
1.2 
1.2 
1.1 
1.2 
1.1 
1.1 
1.1 
1.1 
1.1 
1.0 
1.1 
1.1 
1.1 
1.0 
1.1 
1.0 
4.0 
4.1 
10 
20 
30 
40 
50 
10 
10 
20 
30 
40 
50 
32 40.2 
30 52.3 
29 3.5 
27 22.7 
25 49.8 
10 
20 
40 
3 42.1 
3 37.0 
20 
40 
1 40.7 
l 45.:; 
20 7 1.7 
30 6 53.3 
10 45.1 
50 i 6 37.2 
4 1 
45 
40 
50.7 
57.7 
55.7 
15 3 32.1 
29 
20 
40 
1 43. 8 
1 42.4 
1 41.0 
20 3 27.4 
40 3 22.9 
47 
48 
40 
53.8 
5 l.i) 
50.2 
24 24.6 
8 | 6 29.6 
100 
:; ls.o 
30 
1 30.7 
23 6.7 
21 55.6 
20 50.9 
19 51.9 
18 58.0 
10 
20 
30 
40 
50 
6 15.2 
6 8.4 
6 1.8 
5 55.4 
20 
40 
3 14.5 
3 10.5 
20 
40 
1 3S.4 
1 37.1 
50 
51 
52 
53 
4S.4 
46.7 
45.1 
13.5 
17 
3 6.6 
:;i l 35. 8 
20 134.5 
40 1 33.3 
320 1 32.1 
20 
40 
3 2.9 
2 59.3 
2 55.S 
2 52.5 
2 4!)..", 
2 
10 
20 
30 
40 
50 
18 8.6 
9 
5 49.3 
54 
4 1.0 
40.4 
38.9 
37.5 
30.1 
34.7 
18 
20 
40 
17 23.0 
16 40.7 
16 0.9 
15 23.4 
14 47.8 
10 
20 
30 
40 
50 
5 43.3 
5 37.0 
5 32.0 
5 26.5 
5 21.3 
12 5. 
20 
40 
1 30.9 
1 20.8 
1.1 
l.l 
i.i 
l.l 
l.l 
l.l 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
0.9 
0.9 
0.9 
0.9 
0.9 
0.9 
0.9 
0.8 
0.9 
0.8 
0.8 
0.8 
0.8 
0.8 
0.8 
0.8 
0.7 
56 
57 
58 
50 
10 
2 46. 1 
33 
1 2S.7 
20 
40 
20 
2 43. 1 
2 40.2 
20 
40 
1 27.0 
1 20.5 
3 
14 14.6 
10 
5 16.2 
00 
61~ 
62 
63 
33.3, 
32.0 
30.7 
20.4 
2S.2 
20.0 
25.7 
10 
20 
30 
40 
50 
40 
13 43.7 
13 15.0 
12 48.3 
12 23.7 
12 0.7 
11 38.9 
10 
20 
30 
40 
50 
5 11.2 
5 6.4 
5 1.7 
4 57.2 
4 52.8 
2 37.3 
34 
1 25.4 
20 
40 
2 34.5 
2 31.9 
20 
40 
1 24.3 
1 23.3 
1.1 
21 
2 20.3 
35 1 22.3 
64 
65 
66 
4.3 
4.2 
4.1 
3.9 
3.9 
3.7 
3.7 
3.6 
3.4 
3.4 
3.3 
3.2 
3.2 
3.1 
3.0 
2.9 
2.9 
2.8 
2.8 
20 2 26.8 
40 2 24.3 
20 
40 
121.3 
1 20.3 
110 
4 -is.;, 
10 
20 
30 
40 
50 
50 
10 
20 
30 
40 
50 
11 18.3 
10 58.6 
10 39.0 
10 21.2 
10 3.3 
9 46.5 
10 
20 
30 
40 
50 
4 44.3 
4 40.2 
4 36.3 
4 32.4 
4 28.7 
22 2 21.9 
36 
20 
40 
1 10.3 
1 L8.3 
1 17.4 
67 
24.5 
20 2 19.6 
40 2 17.4 
68 zd.d 
69 22.2 
70 21.0 
71 19.9 
72 j 18.8 
73 17.7 
23 2 15.2 
37 
1 10.5 
12 
10 
20 
30 
40 
50 
4 25.0 
20 2 13.0 
40 2 10.9 
20 
40 
1 15.6 
1 14.7 
9 30.9 
9 16.0 
9 1.9 
8 48.4 
8 35.6 
4 21.4 
4 18.0 
4 14.6 
4 11.3 
4 8.1 
24 2 8.9 
38 
1 I3.S 
74 16.6 
75 15.5 
70 UK 
20 2 7.0 
40 2 5.1 
20 
40 
! 12.0 
1 12.0 
25 2 3.2 
39 
20 
40 
1 11.2 
77~ 
1Q1 
60 
8 23.3 
L3 
4 4.9 
20 2 1.4 
40 1 59.6 
1 10.3 
1 9.5 
78 1 12^3 
70 11.2 
80 ToT 
81 "9~ 
82 8.1 
86 4.1 
10 
20 
30 
40 
50 
8 11.6 
8 0.3 
7 49.5 
7 39.2 
7 29.2 
10 
20 
30 
40 
50 
4 1.8 
3 58.8 
3 55.9 
3 53.0 
3 50.2 
20 157.8 
400 
1 8.7 
20 
40 
97 
1 56.1 
154.4 
20 
40 
1 7.9 
1 7.1 
1 K9 ft 
41 
1 6.3 
70 
7 19.7 
14 
3 47.4 
20 
40 
1 51.2 
149.7 
20 
40 
1 5.5 
1 4.7 
90 
0.0 
28 
148.2 
42 
1 4.0 
Bull. 214—03- 
16 
