Results of cJironometric Tours. 



65 



vertical circle observations of the sun's limb by the method of 

 circum-meridian altitudes and also by the use of a meridian 

 telescope and the Talcott differential method. The vertical 

 circle used was ten inches in diameter and read to five seconds 

 by means of four verniers. The latitude here given depends on, 

 these observations, as those made by the meridian telescope 

 have not yet been reduced. 



Mi St Ehtts 



Scale ] 000 ooo 



"" ' Ill'™ 



Figure 2. — Tricing ulation in the vicinity of Mount Saint Elias. 



Of the six chronometric tours between Sitka and Yakutat 

 bay three only have been reduced, and the results are as follows : 



First trip, June 8 to 13; difference of longitude, 17 m. 48.17 sec. 

 Second trip, June 24 to 29 ; " " " 17 " 48.31 "' 



Third trip, July 9 to 14 ; " " '• 17" 48.16 " 



Of which the indiscriminate mean is 17 m. 48.21 sec. 



