Astronomical and Meteorological Records, £s?c. xxxvii 



Observations made on the River Platte, seven minutes of latitude south 

 of the Camp of July 4th. 



Equal altitudes of Sun to find error of watch, at noon. 



Error of Watch. 



.4 mean of eight lunar distances from sun and times correspondent, to 

 find the longitude. Latitude 6y account 39° 50' 40" JV*. .Assumed 

 longitude 7^ 01' fF. 



Time per Watch, 

 A. M. 



07 



Distance of near- 

 est limbs. 



56° 09' 26" 



Index error. 



— 4' 



July 5, 1820. 



Daily variation of watch 1' 41" losing. 



Longitude deduced, 7" 01' 23", or 105° 20' 45" W. of Greenwich. 



Camp at the base of the Rocky Mountains. 



July 8, 1820. 



July 9, 1820. 



Meridian double altitude of > 

 Antares - - 3 



Index error — 3' 45". Latitude > 

 deduced - - 5 



Meridian double altitude of ^ 

 Antares - - *- ^ 



Index error — 3' 45". Latitude } 

 deduced - - C 



Mean latitude of the camp 



49° 17' 30" 



39 23 40 N. 



At our camp on Boiling-spring Creek, at the distance of about 25 

 miles from James's Peak, (the same designated by Pike as the highest 

 peak,) trigonometrical observations were made for determining the 

 height of the peak above the level of the adjacent country, A base 

 of 1048| feet was accurately measured, and angles taken at its extre- 

 mities, to ascertain another side of the triangle, to serve as a base to 

 determine the height of the mountain. The angles at the extremities 

 of the primary base, corrected for the index error of sextant, vv'ere 

 104° 32' 15" and 65*^ 28' 45" — and the extent of the secondary 

 base as found by calculation, 133372.5 feet. The angles taken at the 

 extremities of the secondary base, included between that line and the 

 lines of vision, to an object distinctly visible at the summit of the 

 peak, were 96° 21' 15" and 81° 17' 45", corrected as above. The 

 angle of elevation qf the top of the peak, observed at the extremity 



