GANNETT.] GEOGRAPHIC TABLES AND FORMULAS. 277 
Table 26. — For obtaining differences of altitude for any minute, etc. — Continued. 
70 
1 

648. 3 
1 
649.9 
2 
651.4 
3 
653.0 
4 
654.5 
5 
656.1 
6 
657.7 
7 
659.2 
8 
660.8 
9 
662.4 
10 
663.9 
11 
665.5 
12 
667. 
18 
668. 6 
14 
670. 2 
15 
671.7 
16 
673.3 
17 
674.8 
18 
676.4 
19 
678.0 
20 
679. 5 
21 
681.1 
22 
682. 6 
23 
(;84. 2 
24 
685.8 
25 
687.3 
26 
688.9 
27 
690.5 
28 
692.0 
29 
693.6 
30 
695. 1 
31 
696.7 
32 
698.3 
33 
699.8 
34 
701.4 
35 
702.9 
36 
704.5 
37 
706.1 
38 
707.6 
39 
709. 2 
40 
710.8 
41 
712.3 
42 
713.9 
43 
715. 5 
44 
717.0 
45 
718.6 
46 
720.2 
47 
721.7 
48 
723.3 
49 
724.8 
50 
726. 4 
51 
728.0 
52 
729. 5 
53 
731.1 
54 
732.7 
55 
734.2 
56 
735.8 
57 
737.4 
58 
738.9 
59 
740.5 
60 
742. 1 
1,484 
2,226 
2,593 
2,599 
2, 606 
2,612 
2,618 
2, 624 
2,631 
2,637 
2, 643 
2, 649 
2,656 
2,662 
2,668 
2, 674 
2, 681 
2, 687 
2, 693 
2,699 
2, 706 
2, 712 
2,718 
2, 724 
2, 731 
2,737 
2, 743 
2,749 
2, 756 
2, 762 
2, 768 
2,774 
2,781 
2,787 
2, 793 
2, 799' 
2, 806 
2, 812 
2,818 
2,824 
2,831 
2, 837 
2,843 
2,849 
2,856 
2, 862 
2, 868 
2,874 
2,881 
2,887 
2, 893 
2,906 
2, 912 
2, 918 
2,924 
2,931 
2, 937 
2,943 
2,949 
2,956 
2,962 
2,968 
3,242 
3,249 
3,257 
3,265 
3,273 
3,281 
3,288 
3, 296 
3,304 
3,312 
3, 320 
3, 327 
3,335 
3, 343 
3, 351 
3,359 
3,366 
3,374 
3, 382 
3,390 
3,398 
3, 405 
3,413 
3,421 
3, 429 
3,437 
3,444 
3,452 
3,460 
3,468 
3,476 
3,483 
3,491 
3,499 
3,507 
3, 515 
3,523 
3,530 
3,538 
3,546 
3,554 
3,562 
3,569 
3,577 
3,585 
3, 593 
3,601 
3,609 
3,616 
3,624 
3,632 
3,640 
3,648 
3,656 
3,663 
3,671 
3,679 
3,687 
3,695 
3,702 
3,710 
3,890 
3, 899 
3,909 
3,918 
3, 927 
3,937 
3,946 
3,955 
3,965 
3,974 
3,993 
4,002 
4,012 
4,021 
4,030 
4, 040 
4,049 
4,058 
4,068 
4,077 
4,087 
4,096 
4, 105 
4,115 
4,124 
4,133 
4,143 
4,152 
4,161 
4,171 
4,180 
4,190 
4,199 
4,208 
4,218 
4,227 
4, 236 
4,246 
4,255 
4,265 
4,274 
4,283 
4,293 
4, 302 
4, 312 
4,321 
4,330 
4,340 
4,349 
4,358 
4,368 
4,377 
4,387 
4,396 
4, 405 
4,415 
4,424 
4,434 
4,443 
4,452 
538 
549 
500 
571 
582 
593 
604 
615 
626 
,647 
,658 
,669 
,680 
,691 
,702 
,713 
,724 
4,735 
4,746 
4,757 
4,768 
4,779 
4,789 
4,800 
4,811 
4,822 
4,833 
4,844 
4,855 
4,975 
4,986 
4,997 
5,008 
5,019 
5,030 
5,041 
5,052 
5,063 
5, 074 
5, 085 
5,096 
5, 107 
5, 118 
5,129 
5,140 
5,151 
5,162 
5,172 
5,183 
5,194 
5,186 
5,199 
5,211 
5,224 
5,236 
5, 249 
5, 261 
5,274 
5, 286 
5, 299 
5,311 
5, 324 
5,336 
5,349 
5,361 
5,374 
5, 386 
5,399 
5,411 
5,424 
5,436 
5, 449 
5,461 
5,474 
5,486 
5,499 
5,511 
5,524 
5,536 
5, 549 
5, 561 
5, 574 
5,586 
5,599 
5, 611 
5, 624 
5, 636 
5,649 
5,661 
5,674 
5,686 
5,699 
5,711 
5, 724 
5,736 
5,749 
5,761 
5,774 
5,786 
5,799 
5,811 
5, 824 
5,836 
5,849 
5,861 
5,874 
5,886 
5,899 
5,911 
5,924 
5,936 
5, 835 
5,849 
5, 863 
5,877 
5,891 
5, 905 
5,919 
5,933 
5,947 
5,961 
5,975 
5, 989 
6,003 
0,017 
6,031 
6, 045 
6,060 
6,074 
6,088 
6,102 
0,116 
6,130 
6,144 
6,158 
6, 172 
6,186 
6,200 
6,214 
6,228 
6,242 
6, 256 
6, 270 
6,284 
6,298 
6, 312 
6,327 
6,341 
6,355 
6,369 
6,383 
6,397 
6,411 
0, 425 
6,439 
6,453 
6, 467 
6,481 
6,495 
6,510 
6,524 
6, 552 
6, 566 
6, 580 
6,594 
6,608 
6,622 
6,636 
6,650 
6,664 
6,678 
Corrections for curva- 
ture, refraction and 
height of instrument." 
Miles. 
Feet. 
3Iiles. 
1.6 
6 
10.2 
2.1 
7 
10.3 
2.5 
8 
10.4 
2.8 
9 
10.5 
3.1 
10 
10.6 
3.4 
11 
10.7 
3.6 
12 
10.8 
3.8 
13 
10.9 
4.1 
14 
11.0 
4.3 
15 
11.1 
4.5 
16 
11.2 
4.7 
17 
11.3 
4.8 
18 
11.4 
5.0 
19 
11.5 
5.2 
20 
11.6 
5.4 
21 
11.7 
5.5 
22 
11.8 
5.7 
23 
11.9 
5.8 
2, 
12.0 
6.0 
25 
12.1 
6.1 
26 
12.2 
6.3 
27 
12.3 
6.4 
28 
12.4 
6.5 
29 
12.5 
6.7 
30 
12.6 
6.8 
31 
12.7 
6.9 
32 
12.8 
7.0 
33 
12.9 
7.2 
34 
13.0 
7.3 
35 
13.1 
7.4 
36 
13.2 
7.5 
37 
13.3 
7.6 
38 
13.4 
7.8 
39 
13.5 
7.9 
40 
13.6 
8.0 
41 
13.7 
8.1 
42 
13.8 
8.2 
43 
13.9 
8.3 
44 
14.0 
8.4 
45 
14.1 
8.5 
46 
14.2 
8.6 
47 
14.3 
8.7 
48 
14.4 
8.8 
49 
14.5 
8.9 
50 
14.6 
9.0 
51 
14.7 
9.1 
52 
14.8 
9.2 
53 
14.9 
9.3 
54 
15.0 
9.4 
55 
15.1 
9.5 
56 
15.2 
9.6 
58 
15.3 
9.7 
59 
15.4 
9.8 
60 
15.5 
9.9 
61 
15.6 
10.0 
62 
15.7 
10.1 
63 
15.8 
15.9 
16.0 
a For all distances under 1.6 miles the correction may be taken as 
is assumed 4.5 feet. 
5 feet. Height of instrument 
