inett] GEOGRAPHIC TABLES AND FORMULAS. 251 
Table 24. — For obtaining differences of altitude for any minute, etc. — Continued. 
7° 
Corrections 
for curva- 
1 
2 
3 
4 
5 
(i 
' 
s 
9 
ture, refraction and 
height of instrument. a 

648.3 
1,297 
1,945 
2,593 
3,242 
3,890 
4,538 
5,186 
5,835 
1 
649.9 
1,300 
1,950 
2, 599 
3, 249 
3, 899 
4, 549 
5, 199 
5, 8 19 
Miles. 
Feet. 
Miles. 
Feet. 
2 
651.4 
1,303 
1,954 
2, 606 
3, 257 
3, 909 
4, 560 
5, 211 
5, 863 
1.6 
6 
10.2 
64 
3 
653. 
1,306 
1,959 
2, 612 
3,265 
3, 918 
4,571 
5,224 
5,877 
2.1 
7 
10.3 
65 
4 
654. 5 
1,309 
1,964 
2, 618 
3, 273 
3, 927 
4, 582 
5, 236 
5, 891 
2.5 
8 
10.4 
67 
5 
656.1 
1,312 
1,968 
2, 624 
3, 281 
3,937 
4,593 
5, 249 
5, 905 
2.8 
9 
10.5 
68 
6 
657.7 
1,315 
1,973 
2, 631 
3, 288 
3,946 
4,604 
5,261 
5, 919 
3.1 
10 
10.6 
69 
7 
659. 2 
1,318 
1,978 
2, 637 
3, 296 
3, 955 
4, 615 
5, 274 
5, 933 
3.4 
11 
10.7 
70 
8 
660. 8 
1, 322 
1,982 
2, 643 
3, 304 
3, 965 
4,626 
5, 286 
5, 947 
3.6 
12 
10.8 
71 
9 
662.4 
1,325 
1,987 
2,649 
3, 312 
3,974 
1,636 
5,299 
5, 961 
3.8 
13 
10.9 
73 
10 
663. 9 
1,328 
1,992 
2,656 
3,320 
3,983 
4,647 
5,311 
5, 975 
4.1 
14 
11.0 
74 
11 
665.5 
1,331 
1, 996 
2, 662 
3, 327 
3,993 
4,658 
5, :r_>i 
5, 98! 
4.3 
15 
11.1 
75 
12 
667. 
1,334 
2, 001 
2, 668 
3, 335 
4, 002 
4, 669 
5, 336 
6, 003 
4.5 
16 
11.2 
77 
13 
668. 6 
1,337 
2, 006 
2, 674 
3, 343 
4,012 
4,680 
5,349 
6, 017 
4.7 
17 
11.3 
78 
11 
670. 2 
1,340 
2, 010 
2,681 
3, 351 
4, 021 
4,691 
5, 361 
6, 031 
4.8 
18 
11.4 
79 
15 
671.7 
1,343 
2, 015 
2,687 
3, 359 
4, 030 
4, 702 
5,374 
6, 045 
5.0 
19 
11.5 
80 
16 
673. 3 
1,347 
2, 020 
2, 693 
3, 366 
4,040 
4,713 
5, 386 
0, 060 
5.2 
20 
11.6 
82 
17 
674.8 
1,350 
2, 025 
2, 699 
3, 374 
4,049 
1,721 
5,399 
ti,074 
5.4 
21 
11.7 
83 
18 
676.4 
1,353 
2, 029 
2, 706 
3, 382 
4,058 
4, 735 
5,411 
6, 088 
5.5 
22 
11.8 
84 
19 
678.0 
1, 356 
2,034 
2, 712 
3,390 
4,068 
4,746 
5,424 
»;, 102 
5.7 
23 
11.9 
86 
20 
679.5 
1,359 
2,039 
2,718 
3,398 
4,077 
4, 757 
5, 436 
6,116 
5.8 
24 
12.0 
87 
21 
681.1 
1,362 
2,043 
2, 724 
3, 405 
4,087 
4,768 
5, 449 
6,130 
6.0 
25 
12. 1 
89 
22 
682. 6 
1,365 
2,048 
2,731 
3, 413 
4,096 
4,779 
5, 461 
6, 14 1 
0.1 
26 
12.2 
90 
23 
liS J. 2 
1,368 
2, 053 
2, 737 
3, 421 
4, 105 
4,789 
5,474 
6, 158 
6.3 
27 
12.3 
91 
24 
685.8 
1,372 
2, 057 
2, 743 
3, 429 
4,115 
4,800 
5, 486 
6,172 
6.4 
28 
12.4 
93 
25 
687.3 
1, 375 
2, 062 
2, 749 
3, 137 
4, 124 
4,811 
5,499 
6, 186 
6.5 
29 
12.5 
94 
26 
688.9 
1,378 
2, 067 
2, 756 
3, 444 
4,133 
4, 822 
5,511 
(i, 200 
6.7 
30 
12.6 
96 
27 
690. 5 
1,381 
2, 071 
2, 762 
3, 452 
4,143 
4,833 
5, 524 
6,214 
6.8 
31 
12.7 
97 
28 
692. 
1,384 
2, 076 
2,768 
3, 460 
4, 152 
4,844 
5,536 
6,228 
6.9 
32 
12.8 
99 
29 
693.6 
1,387 
2,081 
2, 774 
3,468 
4,161 
4,855 
5, 549 
6,242 
7.0 
33 
12. 9 
100 
30 
695. 1 
1,390 
2,085 
2, 781 
3,476 
4,171 
4, 866 
5,561 
6,256 
7.2 
31 
13.0 
102 
31 
696. 7 
1,393 
2,090 
2, 7*7 
3,483 
4,180 
4,877 
5, 574 
6, 270 
7.3 
35 
13.1 
103 
32 
698.3 
1,396 
2, 095 
2, 793 
3,491 
4,190 
4,888 
5, 586 
6, 284 
7.4 
36 
13.2 
105 
33 
699. 8 
1,400 
2, 099 
2,799 
3,499 
4,199 
4,899 
5, 599 
6, 298 
7.5 
37 
13.3 
106' 
34 
701.4 
1,403 
2, 104 
2, 806 
3, 507 
4,208 
4,910 
5,611 
6, 312 
7.6 
38 
13.4 
108 
35 
702.9 
1,406 
2, 109 
2, 812 
3, 515 
4,218 
4, 921 
5,624 
6, 327 
7.8 
39 
13. 5 
109 
36 
704.5 
1,409 
2, 114 
2,818 
3, 523 
4, 227 
4,932 
5, 636 
6,341 
7.9 
40 
13. 6 
111 
37 
706. 1 
1,412 
2,118 
2,824 
3,530 
4, 236 
4,943 
5, 649 
6, 355 
8.0 
41 
13.7 
112 
38 
707.6 
1,415 
2, 123 
2, 831 
3,538 
4,246 
4,953 
5,661 
6, 369 
8.1 
42 
13.8 
114 
39 
709.2 
1,418 
2,128 
2, 837 
3, 546 
4,255 
4,964 
5, 674 
6,383 
8.2 
43 
13.9 
115 
40 
710.8 
1,422 
2, 132 
2,843 
3,554 
4,265 
4,975 
5, 686 
6, 397 
8.3 
44 
14.0 
117 
41 
712. 3 
1,425 
2,137 
2,849 
3, 562 
4, 274 
4,986 
5,699 
6,411 
8.4 
45 
14.1 
119 
42 
713.9 
1, 428 
2, 142 
2,856 
3, 569 
4, 283 
4,997 
5,711 
6, 425 
8.5 
46 
11.2 
120 
43 
715. 5 
1,431 
2, 146 
2, 862 
3, 577 
4, 293 
5, 008 
5, 724 
(i, 439 
8.6 
47 
14.3 
122 
44 
717.0 
1,434 
2, 151 
2, 868 
3, 585 
4,302 
5,019 
5, 736 
(i, 453 
8.7 
48 
14.4 
124 
45 
718.6 
1,437 
2, 156 
2, 874 
3, 593 
4,312 
5, 030 
5, 749 
6, 467 
8.8 
49 
14.5 
125 
46 
720. 2 
1,440 
2, 160 
2, 881 
3, tiOl 
4, 321 
5, 041 
5, 761 
6, 481 
8.9 
50 
14.6 
127 
47 
721.7 
1,443 
2, 165 
2, 887 
3,609 
4, 330 
5,(152 
5, 771 
6, 195 
9.0 
51 
14.7 
129 
48 
723. 3 
1,447 
2, 170 
2, 893 
3, 616 
4,340 
5, 063 
5, 786 
6, 510 
9.1 
52 
14.8 
130 
49 
724.8 
1,450 
2,175 
2,899 
3, 624 
4,349 
5, 074 
5,799 
6, 524 
9.2 
53 
14.9 
132 
50 
726. 4 
1,453 
2,179 
2, 906 
3, 632 
4,358 
5, 085 
5,811 
6,538 
9.3 
54 
15.0 
134 
51 
728. 
1,456 
2, 184 
2, 912 
3, 640 
4,368 
5, 096 
5, 824 
6, 552 
9.4 
55 
15.1 
135 
52 
729. 5 
1,459 
2, 189 
2, 918 
3, 648 
4,377 
5, 107 
5, 836 
6, 566 
9.5 
56 
15.2 
137 
53 
731.1 
1, 462 
2, 193 
2, 924 
3, 656 
4,387 
5, 118 
5, 849 
6, 580 
9.6 
58 
15.3 
139 
54 
732. 7 
1,465 
2,198 
2, 931 
3, 663 
4, 396 
5, 129 
5, 861 
6,594 
9.7 
59 
15.4 
141 
55 
734. 2 
1,468 
2, 203 
2, 937 
3, 671 
4, 405 
5, 140 
5,874 
<;, COS 
9.8 
60 
15.5 
142 
56 
735. 8 
1, 472 
2, 207 
2,943 
3, 679 
4, 415 
5, 151 
5,886 
6, 622 
9.9 
61 
15.6 
144 
57 
737.4 
1,475 
2,212 
2, 949 
3,687 
4,424 
5, 162 
5,899 
6, 636 
10.0 
62 
15.7 
146 
58 
738. 9 
1,478 
2, 217 
2, 956 
3, 695 
4,434 
5,172 
5,911 
6, 650 
10.1 
63 
15.8 
148 
59 
740. 5 
1,481 
2, 221 
2,962 
3,702 
4,443 
5,183 
5,924 
6,664 
15.9 
.16.0 
150 
151 
GO 
742. 1 
1,484 
2,226 
2, 968 
3,710 
4,452 
5,194 
5,936 
6, 678 
a For all distances under 1. 
3 assumed 4.5 feet. 
miles the correction may be taken as + 5 feet. Height of instrument 
