66 T. C. Mendenhall — Mount Saint Ellas. 



A preliminary reduction of a portion of the chronometric 

 comparisons between Tacoma and Sitl^a gives for the longitude 

 of Sitka 9 hours 1 minute 20.5 seconds, from Avhich we have the 

 adopted longitude of Yakutat astronomical station 9 hours 

 19 minutes 8.7 seconds. The latitude of this station from 

 circum-meridian observations on the sun's limb, consisting of 

 sixteen pointings on the sun near culmination on August 1, 

 1892, was 59° 33' 51.8", and on August 11, 1892, from twenty 

 pointings, the result was 59° 33' 48.2", the mean of which is 

 59° 33' 50", which is accepted as the latitude of this station, 

 subject, of course, to further small correction from the reduc- 

 tion of the results obtained from the meridian telescope work. 

 Extending these coordinates to the summit of mount Saint 

 Elias by means of the scheme of triangulation as shown in the 

 sketch, the latitude of the summit is found to be 60° 17' 35", 

 and the longitude 140° 55' 21.5". 



The principal base for the determination of the position of 

 the summit of the mountain was a line connecting mount 

 Hoorts and South base. The length of this line was a little less 

 than 38,000 metres, or about 232- miles, and the angle which is 

 subtended at mount Saint Elias was about 20°. 



Incidentally in connection Avith this work, the height of the 

 summit of the mountain Avas determined. A series of zenith 

 distance measurements Avas executed from tive stations, namely : 

 North base. South base, mount Hoorts, Ocean cape, and the 

 astronomical station. At the latter point observations Avere 

 made on fourteen different days. The result for each day is the 

 mean of three sets of six repetitions each, and the series is as 

 foUoAvs, the observations being made near noon : 



ZENITH DISTANCE OF MOUNT SAINT ELIAS. 



June 11, 1892 87° 20^ 50.3'^ 



" IS, " 87° 20^ 64.2^^ 



" 27, " 87° 20^ 51.8^^ 



" 28, " 87° 20^ 51.3^^ 



July 9, " 87° 20^ 57.1^^ , 



" 10, " 87° 20' 49.8'^ 



" 1], " 87° 20' 44. 8^' 



" i;-5, " 87° 20' 40.6'' 



" 23, " 87° 20' 59.8" 



" 29, " 87° 20' 36.1" 



