Table IV. is to correct for the diminution of gravity in ascending from the sea-level.
To use these Tables: The barometer readings at the upper and lower stations having been corrected and reduced to temperature 32° F., take out from Table I. the numbers opposite the corrected readings, and subtract the lower from the upper. Multiply this difference successively by the factors found in Tables II. and III. The factor from Table III. may be neglected unless precision is desired. Finally, add the correction taken from Table IV.
Table I.
Approximate Height due to Barometric Pressure.
| Inches. | Feet. | Inches. | Feet. | Inches. | Feet. |
| 31·0 | 0 | 28·2 | 2475 | 25·4 | 5209 |
| 30·9 | 84 | ·1 | 2568 | ·3 | 5312 |
| ·8 | 169 | 28·0 | 2661 | ·2 | 5415 |
| ·7 | 254 | 27·9 | 2754 | ·1 | 5519 |
| ·6 | 339 | ·8 | 2848 | 25·0 | 5623 |
| ·5 | 425 | ·7 | 2942 | 24·9 | 5728 |
| ·4 | 511 | ·6 | 3037 | ·8 | 5833 |
| ·3 | 597 | ·5 | 3132 | ·7 | 5939 |
| ·2 | 683 | ·4 | 3227 | ·6 | 6045 |
| ·1 | 770 | ·3 | 3323 | ·5 | 6152 |
| 30·0 | 857 | ·2 | 3419 | ·4 | 6259 |
| 29·9 | 944 | ·1 | 3515 | ·3 | 6366 |
| ·8 | 1032 | 27·0 | 3612 | ·2 | 6474 |
| ·7 | 1120 | 26·9 | 3709 | ·1 | 6582 |
| ·6 | 1208 | ·8 | 3806 | 24·0 | 6691 |
| ·5 | 1296 | ·7 | 3904 | 23·9 | 6800 |
| ·4 | 1385 | ·6 | 4002 | ·8 | 6910 |
| ·3 | 1474 | ·5 | 4100 | ·7 | 7020 |
| ·2 | 1563 | ·4 | 4199 | ·6 | 7131 |
| ·1 | 1653 | ·3 | 4298 | ·5 | 7242 |
| 29·0 | 1743 | ·2 | 4398 | ·4 | 7353 |
| 28·9 | 1833 | ·1 | 4498 | ·3 | 7465 |
| ·8 | 1924 | 26·0 | 4598 | ·2 | 7577 |
| ·7 | 2015 | 25·9 | 4699 | ·1 | 7690 |
| ·6 | 2106 | ·8 | 4800 | 23·0 | 7803 |
| ·5 | 2198 | ·7 | 4902 | 22·9 | 7917 |
| ·4 | 2290 | ·6 | 5004 | ·8 | 8032 |
| ·3 | 2382 | ·5 | 5106 | ·7 | 8147 |
Table I.—continued.
Approximate Height due to Barometric Pressure.
| Inches. | Feet. | Inches. | Feet. | Inches. | Feet. |
| 22·6 | 8262 | 18·9 | 12937 | 15·2 | 18632 |
| ·5 | 8378 | ·8 | 13076 | ·1 | 18805 |
| ·4 | 8495 | ·7 | 13215 | 15·0 | 18979 |
| ·3 | 8612 | ·6 | 13355 | 14·9 | 19154 |
| ·2 | 8729 | ·5 | 13496 | ·8 | 19330 |
| ·1 | 8847 | ·4 | 13638 | ·7 | 19507 |
| 22·0 | 8966 | ·3 | 13780 | ·6 | 19685 |
| 21·9 | 9085 | ·2 | 13923 | ·5 | 19865 |
| ·8 | 9205 | ·1 | 14067 | ·4 | 20046 |
| ·7 | 9325 | 18·0 | 14212 | ·3 | 20228 |
| ·6 | 9446 | 17·9 | 14358 | ·2 | 20412 |
| ·5 | 9567 | ·8 | 14505 | ·1 | 20597 |
| ·4 | 9689 | ·7 | 14652 | 14·0 | 20783 |
| ·3 | 9811 | ·6 | 14800 | 13·9 | 20970 |
| ·2 | 9934 | ·5 | 14949 | ·8 | 21159 |
| ·1 | 10058 | ·4 | 15099 | ·7 | 21349 |
| 21·0 | 10182 | ·3 | 15250 | ·6 | 21541 |
| 20·9 | 10307 | ·2 | 15402 | ·5 | 21734 |
| ·8 | 10432 | ·1 | 15554 | ·4 | 21928 |
| ·7 | 10558 | 17·0 | 15707 | ·3 | 22124 |
| ·6 | 10684 | 16·9 | 15861 | ·2 | 22321 |
| ·5 | 10812 | ·8 | 16016 | ·1 | 22520 |
| ·4 | 10940 | ·7 | 16172 | 13·0 | 22720 |
| ·3 | 11069 | ·6 | 16329 | 12·9 | 22922 |
| ·2 | 11198 | ·5 | 16487 | ·8 | 23126 |
| ·1 | 11328 | ·4 | 16646 | ·7 | 23331 |
| 20·0 | 11458 | ·3 | 16806 | ·6 | 23538 |
| 19·9 | 11589 | ·2 | 16967 | ·5 | 23746 |
| ·8 | 11721 | ·1 | 17129 | ·4 | 23956 |
| ·7 | 11853 | 16·0 | 17292 | ·3 | 24168 |
| ·6 | 11986 | 15·9 | 17456 | ·2 | 24381 |
| ·5 | 12120 | ·8 | 17621 | ·1 | 24596 |
| ·4 | 12254 | ·7 | 17787 | 12·0 | 24813 |
| ·3 | 12389 | ·6 | 17954 | 11·9 | 25032 |
| ·2 | 12525 | ·5 | 18122 | ·8 | 25253 |
| ·1 | 12662 | ·4 | 18291 | ·7 | 25476 |
| 19·0 | 12799 | ·3 | 18461 | ·6 | 25700 |