Height of Mount St. Ellas. 



^y?.: 



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. Ellas. 



Station. 



Angle. 



St. Elias 5° 23^ 38^ 



Western base 98 29 12 



Eastern base 76 07 10 



16,876 ft. log. 

 Dist. E. base — ^Y. base = 4.227270 



A. 0. log. sine = 1.026862 



log. sine = 9.995218 



log. sine = 9.987129 



St. Elias — W. base = . . . 5.241261 



St. Elias — E. base = . . . 5.249350 



log. feet. log. miles, miles. 



Log. distance : St. Elias — W. base = 5.241261 1.518627 33.01 



Los:, tan angle of elevation 5° 43' ^= 9.000465 



Curvature and refraction 

 AVestern base above sea . . 



St. Elias above sea = . . . 



1.7447 ft. 

 + 623 

 + 10 



18080 ft. 



4.241726 



(.'orrection for curvature and 

 refraction in feet = f sq. of dist. 

 in miles. 



log. distance miles 



log. 4 ■■ 

 A. C. log. 7 ■ 



1.51863 

 1.51863 

 0.60206 

 9.15490 



log. 623 ft. = 2.79422 



log. feet. 



Log. distance ; St. Elias — E. base = 5.249350 



Log. tan 5° 37' 8.992750 



Curvature and refraction . 

 E. base above sea == 



St. Elias above sea - 



17462 = 4.242100 

 + 646 

 + 10 log. 646 ft. 



log. miles, miles. 

 1.526716 33.63 

 1.526716 

 0.602060 

 9.154902 



r 2.810394 



18118 ft. 



Mean elevation above sea level ^ 18099 ft. ; or in round numbers 18,100 ft. 



Mr. A. Lindenkohl, of the U. S. Coast and Geodetic Survey, 

 and Mr. S. S. Gannett have each computed the geographic 

 position of Mount St. Elias, using the azimuth and angle of 

 elevation of the mountain obtained by the U. S. Coast Survey at 

 Port Mulgrave in 1874,* and the elevation given above. From 



* Report of the Superintendent of the TJ. S. Coast Survey for 1875. 

 Appendix 10, pp. 157-188. 



