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:

Computation of the Height of Mount St. Elias.