232 



/. C. Rmsell— Mount St. Elias. 



the longitude of Cadiz as 6° 19' 07" west of Greenwich, the figures 

 given in the table are obtained. 



The data from which the various determinations made previ- 

 ous to 1874 were obtained have not been published. The obser- 

 vations made by Messrs. Dall and Baker, of the U. S. Coast and 

 Geodetic Survey, are jjublished in full in the annual report of 

 that Survey for 1875, already referred to. The observations 

 made by myself last summer as a part of the work of an expedi- 

 tion sent to Mount St. Elias by the National Geographic Society 

 and the U. S. Geological Survey, from which the height and 

 position of the mountain have been computed, are as follows : 



A base line 16,876 feet long was measured on the beach at Icy 

 bay. The line, with the exception of section C to D, as shown 

 beloAv, was measured three times in sections of about 3,000 feet 

 each. The distances given below in columns 1 and 2 were ob- 

 tained with a 100-foot steel tape, and those given in column 3 

 with a 300-foot iron wire. These are rough measurements, made 

 without the use of a plumb-bob and without taking account of 

 temiDerature. The ground was quite smooth, with a rise of about 

 five feet in the center ; but section Cto D was crossed by a stream 

 channel about 300 feet broad and twenty feet deep. Throughout 

 much of the distance the ground was covered with grass, which 

 was only partially cleared away. The stations at the ends of the 

 line were ten feet above high tide. The bearing of the line from 

 the western base was S. 89° E., magnetic. 



Measurements of Base Line. 



The measurements of angles were made with a gradienter 

 reading by vernier to minutes. The error of the vertical arc 

 was — 3', and remained constant during the observations. 



