| Right vernier. | Left vernier. | Vertical angle. | Date. | ||
| 1. | St. Elias Eastern base | 218° 35' 317 6 | 38° 35' 137 7 | +5° 40' —— | 1891, Aug. 14, 10 a.m. " " " |
| 2. | St. Elias Eastern base | 218° 34' 317 6 | 38° 37' 137 7 | +5° 40' —— | "
" " " " " |
| 3. | St. Elias Eastern base | 218° 37' 317 6 | 38° 39' 137 8 | +5° 40' —— | "
" " " " " |
| 4. | St. Elias Eastern base | 261° 41' 0 10 | 81° 43' 180 11 | +5° 40' —— | "
" " " " " |
| 5. | St. Elias Eastern base | 261° 41' 0 10 | 81° 43' 180 10 | +5° 40' —— | "
" " " " " |
| 6. | St. Elias Eastern base | 50° 15' 148 45 | 230° 15' 328 45 | +5° 40' —— | 1891, Aug. 14, 6 p.m. " " " |
| 7. | St. Elias Eastern base | 50° 15' 148 45 | —— —— | —— —— | "
" " " " " |
| 8. | St. Elias Eastern base | 181° 5' 279 30 | 1° 5' 99 32 | +5° 40' —— | "
" " " " " |
Measurements of Angles at Eastern Base.
| Right vernier. | Left vernier. | Vertical angle. | Date. | ||
| 1. | St. Elias Western base | 252° 26' 176 19 | 72° 27' 356 19 | +5° 34' —— | 1891, Aug. 17, 11.30 a.m. " " " |
| 2. | St. Elias Western base | 252° 26' 176 19 | 72° 26' 356 19 | +5° 34' —— | "
" " " " " |
| 3. | St. Elias Western base | 252° 25' 176 19 | 72° 26' 356 19 | +5° 34' —— | "
" " " " " |
| 4. | St. Elias Western base | 252° 26' 176 19 | 72° 27' 356 19 | +5° 34' —— | "
" " " " " |
| 5. | St. Elias Western base | 252° 26' 176 19 | 72° 26' —— | +5° 34' —— | "
" " " " " |
| 6. | St. Elias Western base | 252° 27' 176 20 | 72° 28' 356 20 | +5° 34' —— | 1891, Aug. 17, 2 p.m. " " " |
| 7. | St. Elias Western base | 252° 28' 176 21 | —— —— | —— —— | 1891, Aug. 17, 4.30 p.m. " " " |
From these observations the following angles between the base line and the line of sight to the summit of Mount St. Elias are obtained. The correction for error of vertical circle has been applied to the angles of elevation.
Resulting Angles.
| WESTERN BASE. | EASTERN BASE. | ||||||
| Right vernier. | Left vernier. | Corrected vertical angle. | Right vernier. | Left vernier. | Corrected vertical angle. | ||
| 1 2 3 4 5 6 7 8 | 98° 31' 98 32 98 29 98 29 98 29 98 30 98 30 98 25 | 98° 32' 98 30 98 29 98 28 98 27 98 30 —— 98 27 | +5° 43' +5 43' +5 43' +5 43' +5 43' +5 43' +5 43' +5 43' | 1 2 3 4 5 6 7 | 76° 7' 76 7 76 6 76 7 76 7 76 7 76 7 | 76° 8' 76 7 76 7 76 8 —— 76 8 | +5° 37' +5 37 +5 37 +5 37 +5 37 +5 37 |
| 98 29 22 | 98 29 00 | 76 6 51 | 76 7 36 | ||||
| Mean 98° 29' 12" +5° 43' | Mean 76° 7' 10" +5° 37' | ||||||
The known elements of the triangle from which the distance of St. Elias from the ends of the base line may be determined are:
These data were sent from the field to the Secretary of the National Geographic Society, and, in connection with other measurements made at the same time, have been computed by Mr. S. S. Gannett, of the United States Geological Survey. The results of the computation, so far as they relate to Mount St. Elias, are given below: