80 
GEOGRAPHIC TABLES AND FORMULAS. 
[BULL. 214 
Table 10. — Areas of quadrilaterals of earth's surface of 15' extent in latitude and 
longitude. 
[From Smithsonian Geographical Tables.] 
Middle latitude 
Area in 
Middle latitude 
Area in 
Middle latitude 
Area in 
of quadrilateral. 
square miles. 
of quadrilateral. 
square miles. 
of quadrilateral. 
square miles. 
o 
/ 
// 
o 
/ 
// 

t 
// 

07 
30 
297. 02 
5 
37 
30 
295. 63 
11 
07 
30 
291. 59 

15 
00 
297. 02 
5 
45 
00 
295. 57 
11 
15 
00 
291. 47 

22 
30 
297. 02 
5 
52 
30 
295. 51 
11 
22 
30 
291. 34 

30 
00 
297. 01 
6 
00 
00 
295. 44 
11 
30 
00 
291. 22 

37 
30 
297. 01 
6 
07 
30 
295. 37 
11 
37 
30 
291.09 

45 
00 
297. 00 
6 
15 
00 
295. 31 
11 
45 
00 
290. 96 

52 
30 
296. 99 
6 
22 
30 
295. 24 
11 
52 
30 
290. 83 
1 
00 
00 
296. 98 
6 
30 
00 
295. 17 
12 
00 
00 
290. 70 
07 
30 
296. 97 
6 
37 
30 
295. 09 
12 
07 
30 
290. 57 
15 
00 
296. 96 
6 
45 
00 
295. 02 
12 
15 
00 
290. 44 
22 
30 
296. 94 
6 
52 
30 
294. 95 
12 
22 
30 
290. 30 
30 
00 
296. 93 
7 
00 
00 
294. 87 
12 
30 
00 
290. 17 
37 
30 
296. 91 
7 
07 
30 
294. 79 
12 
37 
30 
290. 03 
45 
00 
296. 89 
7 
15 
00 
294. 71 
12 
45 
00 
289. 89 
52 
30 
296. 87 
7 
22 
30 
294. 63 
12 
52 
30 
289. 75 
2 
00 
00 
296. 85 
7 
30 
00 
294. 55 
13 
00 
00 
289. 61 
2 
07 
30 
296. 82 
7 
37 
30 
294. 47 
13 
07 
30 
289. 47 
2 
15 
00 
296. 80 
7 
45 
00 
294. 39 
13 
15 
00 
289. 33 
2 
22 
30 
296. 77 
7 
52 
30 
294. 30 
13 
22 
30 
289. 18 
2 
30 
00 
296. 75 
8 
00 
00 
294. 21 
13 
30 
00 
289. 03 
2 
37 
30 
296. 72 
8 
07 
30 
294. 12 
13 
37 
30 
288. 88 
2 
45 
00 
296. 69 
8 
15 
00 
294. 03 
13 
45 
00 
288. 73 
2 
52 
30 
296. 66 
8 
22 
30 
293. 94 
13 
52 
30 
288. 58 
3 
00 
00 
296. 63 
8 
30 
00 
293. 85 
14 
00 
00 
288. 43 
3 
07 
30 
296. 60 
8 
37 
30 
293. 75 
14 
07 
30 
288. 28 
3 
15 
00 
296. 56 
8 
45 
00 
293. 66 
14 
15 
00 
288. 12 
3 
22 
30 
296. 53 
8 
52 
30 
293. 56 
14 
22 
30 
287. 96 
3 
30 
00 
296. 49 
9 
00 
00 
293. 47 
14 
30 
00 
287. 81 
3 
37 
30 
296. 45 
9 
07 
30 
293. 37 
14 
37 
30 
287. 65 
3 
45 
00 
296. 41 
9 
15 
00 
293. 27 
14 
45 
00 
287. 49 
3 
52 
30 
296. 36 
9 
22 
30 
293. 16 
14 
52 
30 
287. 33 
4 
00 
00 
296. 32 
9 
30 
00 
293. 06 
15 
00 
00 
287. 17 
4 
07 
30 
296. 28 
9 
37 
30 
292. 95 
15 
07 
30 
287. 00 
4 
15 
00 
296. 23 
9 
45 
00 
292. 85 
15 
15 
00 
286. 83 
4 
22 
30 
296. 18 
9 
52 
30 
292. 74 
15 
22 
30 
286. 67 
4 
30 
00 
296. 13 
10 
00 
00 
292. 63 
15 
30 
00 
286. 50 
4 
37 
30 
296. 08 
10 
07 
30 
292. 52 
15 
37 
30 
286. 33 
4 
45 
00 
296. 03 
10 
15 
00 
292. 41 
15 
45 
00 
286. 16 
4 
52 
30 
295. 98 
10 
22 
30 
292. 30 
15 
52 
30 
285. 99 
5 
00 
00 
295. 93 
10 
30 
00 
292. 19 
16 
00 
00 
285. 82 
5 
07 
30 
295. 87 
10 
37 
30 
292. 07 
16 
07 
30 
285. 64 
5 
15 
00 
295. 81 
10 
45 
00 
291.95 
16 
15 
00 
285. 46 
5 
22 
30 
295. 75 
10 
52 
30 
291. 83 
16 
22 
30 
285. 28 
5 
30 
00 
295. 69 
11 
00 
00 
291. 71 
16 
30 
00 
285. 10 
