r.ANNETT.] GEOGKAPHIC TABLES AND FORMULAS. 281 
Table 26. — For obtain itig differences of altitude for any minute, etc. — Continued. 
11° 
Corrections for 
curva- 
1 
2 
3 
4 
5 
6 
7 
8 
9 
ture 
. refraction 
. and 
height of instrument.a 

1, 026. 3 
2,053 
3,079 
4,105 
5,132 
6,158 
7,184 
8,211 
9,237 
1 
1,027.9 
2, 056 
3,084 
4,112 
5,140 
6,168 
7,195 
8,223 
9,251 
Miles. 
Feet. 
Miles. 
Feet. 
2 
1,029.5 
2,059 
3,089 
4,118 
5, 148 
6,177 
7,207 
8,236 
9,266 
1.6 
6 
10.2 
64 
3 
1, 031. 1 
2, 062 
3, 093 
4,124 
5, 156 
6,187 
7,218 
8,249 
9,280 
2.1 
7 
10.3 
65 
4 
1,032.7 
2,065 
3,098 
4,131 
5,164 
6,196 
7,229 
8,262 
9, 294 
2.5 
8 
10.4 
67 
5 
1,034.3 
2,069 
3,103 
4,137 
5, 172 
6,206 
7, 240 
8, 275 
9,309 
2.8 
9 
10.5 
68 
6 
1,036 
2, 072 
3,108 
4,144 
5,180 
6,215 
7,251 
8, 287 
9,323 
3.1 
10 
10.6 
69 
7 
1,038 
2. 075 
3,113 
4,150 
5,188 
6, 225 
7,263 
8,300 
9,338 
3.4 
11 
10.7 
70 
8 
1,039 
2; 078 
3,117 
4,156 
5,196 
6,235 
7, 274 
8,313 
9,352 
3.6 
12 
10.8 
71 
9 
1,041 
2, 081 
3, 122 
4,163 
5, 204 
6, 244 
7,285 
8, 326 
9,366 
3.8 
13 
10.9 
73 
10 
1,042 
2, 085 
3,127 
4,169 
5,212 
6,254 
7,296 
8,338 
9,381 
4.1 
14 
11.0 
74 
11 
1,044 
2, 088 
3, 132 
4,176 
5.219 
6, 263 
7,307 
8, 351 
9, 395 
4.3 
15 
11.1 
75 
12 
1,045 
2, 091 
3,136 
4,182 
5/227 
6, 273 
7,318 
8,364 
9,409 
4.5 
16 
11,2 
77 
13 
1,047 
2, 094 
3,141 
4,18,s 
5, 235 
6,283 
7,330 
8,377 
9,424 
4.7 
17 
11.3 
78 
14 
1,049 
2,097 
3,146 
4,19.") 
5,243 
6,292 
7, 341 
8,390 
9,438 
4.8 
18 
11.4 
79 
15 
1,050 
2,101 
3, 151 
4, 201 
5, 251 
6,302 
7,352 
8,402 
9,453 
5.0 
19 
11.5 
80 
16 
1,052 
2, 104 
3,156 
4,208 
5,259 
6,311 
7,363 
8,415 
9,467 
5.2 
20 
11.6 
82 
17 
1,053 
2,107 
3,160 
4, 214 
5, 267 
6,321 
7,374 
8, 428 
8,481 
5.4 
21 
11.7 
83 
18 
1,055 
2, 110 
3,165 
4,220 
5,275 
6,330 
7,386 
8,441 
9,496 
5.5 
22 
11.8 
84 
19 
1,057 
2, 113 
3,170 
4, 227 
5,283 
6,340 
7,397 
8,453 
9,510 
5.7 
23 
11.9 
86 
20 
1,058 
2,117 
3,175 
4,233 
5,291 
6,350 
7,408 
8, 466 
9,524 
5.8 
24 
12.0 
87 
21 
1,060 
2, 120 
3,180 
4,239 
5, 299 
6, 359 
7,419 
8,479 
9,639 
6.0 
25 
12.1 
89 
22 
1,061 
2,123 
3,184 
4, 246 
5,307 
6,369 
7,430 
8, 492 
9,553 
6.1 
26 
12.2 
90 
23 
1,063 
2,126 
3,189 
4, 252 
5,315 
6,378 
7,441 
8, .504 
9,568 
6.3 
27 
12.3 
91 
24 
1,065 
2,129 
3,194 
4, 259 
5,323 
6,388 
7,453 
8, 517 
9,582 
6.4 
28 
12.4 
93 
25 
1,066 
2,133 
3,199 
4,265 
5, 331 
6,398 
7,464 
8,530 
9,596 
6.5 
29 
12.5 
94 
26 
1,068 
2,136 
3,204 
4,271 
5,339 
6,407 
7,475 
8,543 
9,611 
6.7 
30 
12.6 
96 
27 
1,069 
2, 139 
3,208 
4,278 
5,347 
6,417 
7,486 
8,556 
9,625 
6.8 
31 
12.7 
97 
28 
1,071 
2,142 
3,213 
4,284 
5,355 
6,426 
7,497 
8,568 
9,639 
6.9 
32 
12.8 
99 
29 
1,073 
2, 145 
3,218 
4,291 
5, 363 
6,436 
7,509 
8,581 
9,654 
7.0 
33 
12.9 
100 
30 
1,074 
2,148 
8,223 
4,297 
5,371 
6,445 
7,520 
8,594 
9,668 
7.2 
34 
13.0 
102 
31 
1,076 
2, 152 
3,227 
4,303 
5,379 
6,455 
7,531 
8,607 
9,682 
7.3 
35 
13.1 
103 
32 
1,077 
2,156 
3, 232 
4,310 
5, 387 
6,465 
7,542 
8,619 
9,697 
7.4 
36 
13.2 
105 
33 
1,079 
2,158 
3,237 
4,316 
5,395 
6,474 
7,553 
8,632 
9,711 
7.5 
37 
13.3 
106 
34 
1,081 
2,161 
3,242 
4,323 
5, 403 
6,484 
7,564 
8,645 
9, 726 
7.6 
38 
13.4 
108 
35 
1,082 
2,164 
3,247 
4,329 
5,411 
6,493 
7,576 
8,6.58 
9,740 
7.8 
39 
13.5 
109 
36 
1,084 
2,168 
3,252 
4,335 
5,419 
6,503 
7.587 
8,671 
9,755 
7.9 
40 
13.6 
111 
37 
1,085 
2,171 
3,256 
4,342 
5,427 
6,513 
7,598 
8,683 
9,769 
8.0 
41 
13.7 
112 
38 
1,087 
2,174 
3,261 
4,348 
5,435 
6,522 
7,609 
8, 696 
9,783 
8.1 
42 
13.8 
114 
39 
1,089 
2; 177 
3,266 
4,355 
5,443 
6,532 
7,621 
8,709 
9,798 
8.2 
43 
13.9 
115 
40 
1,090 
2,181 
3,271 
4,361 
5,451 
6,542 
7,632 
8,722 
9,812 
8.3 
44 
14.0 
117 
41 
1,092 
2,184 
3,276 
4,367 
5, 459 
6, 551 
7,643 
8, 735 
9,827 
8.4 
45 
14.1 
119 
42 
1,093 
2,187 
3,280 
4,374 
5,467 
6, .561 
7,654 
8,748 
9,841 
8.5 
46 
14.2 
120 
43 
1,095 
2,190 
3,285 
4,380 
5, 475 
6, 570 
7,665 
8,760 
9, 856 
8.6 
47 
14.3 
122 
44 
1,097 
2, 193 
3,290 
4,387 
5,483 
6, 580 
7,677 i 8,773 
9,870 
8.7 
48 
14.4 
124 
45 
1,098 
2,197 
3,295 
4,393 
5,491 
6,590 
7,688 
8,786 
9,884 
8.8 
49 
14.5 
125 
46 
1,100 
2,200 
3,300 
4,399 
5,499 
6, 599 
7,699 
8,799 
9, 899 
8.9 
50 
14.6 
127 
47 
1,101 
2,203 
3,304 
4,406 
5,507 
6,609 
7,710 
8,812 
9,913 
9.0 
51 
14.7 
129 
48 
1,103 
2,206 
3,309 
4,412 
5,515 
6,618 
7,721 
8,825 
9,928 
9.1 
52 
14.8 
130 
49 
1, 105 
2,209 
3,314 
4,419 
5, 523 
6,628 
7,733 
8,837 
9, 942 
9.2 
53 
14.9 
132 
50 
1,106 
2,213 
3,319 
4,425 
5,531 
6,638 
7,744 
8,850 
9,956 
9.3 
54 
15.0 
134 
51 
1,108 
2,216 
3,324 
4, 431 
5, 539 
6, 647 
7,755 
8,863 
9,971 
9.4 
55 
15.1 
135 
52 
1,109 
2,219 
3,328 
4,438 
5, 547 
6, 6.57 
7,766 
8,876 
9,985 
9.5 
56 
15.2 
137 
53 
1,111 
2,222 
3,333 
4,444 
5, 555 
6,666 
7,778 
8,889 
10, 000 
9.6 
58 
15.3 
139 
54 
1,113 
2,225 
3,338 
4,451 
.5,563 
6, 676 
7,789 
8,901 
10, 014 
9.7 
59 
15.4 
141 
55 
1,114 
2, 229 
3,343 
4, 457 
5, 571 
6, 686 
7,800 
8,914 
10, 029 
9.8 
60 
15.5 
142 
56 
1,116 
2,232 
3,348 
4,464 
5,579 
6,695 
7,811 
8,927 
10, 043 
9.9 
61 
15.6 
144 
57 
1,117 
2, 235 
3,352 
4,470 
5, 587 
6, 705 
7, 822 
8,940 
10, 0.57 
10.0 
62 
15.7 
146 
58 
1,119 
2,238 
3,357 
4,476 
5, 595 
6, 715 
7,834 
8,953 
10,072 
10.1 
63 
15.8 
148 
59 
1,121 
2,241 
3,362 
4,483 
5,603 
6, 724 
7,845 
8,966 
10, 086 
15.9 
16.0 
150 
151 
60 
1, 122 
2,245 
3,367 
4,489 
5, 611 
6,734 
7,856 
8,978 
10,101 
«For all distances under 1.6 miles the correction may be talcen as 
s assumed 4.5 feet. 
5 feet. Height of instrument 
