GIL [ 1749. 
ENCAMPMENT AT FORT LARAMIE, 4,470 FEET ABOVE THE LEVEL OF THE 
e GULF OF MEXIvO. 
Determination of latitude, July 18, 1842—allitude of Polaris. 
OBSERVATIONS. 
Double altitude of Polaris. Time of chronometer. 
Deg. min. sec. h. min, set. “ 
82 59 10 71" "se 24 
83 50 ll 00 
83 02 30 ll 41 34 7 
83 04 50 ll 43 45 
83 06 00 Bt 45 31 
Thermometer 63°. 
Index error == ++ 25 sec. 
RESULT OF CALCULATION. 
True altitude. Mean time. Latitude. 
min. sec. kh. min. ste. Deg. min. 
41 30 38 9 ol 14 42 12 10 
Determination of longitude, July 20, 1842—allitude Le the sue og Z 
ro OBSERVATIONS. i 
Pe tS Tees “Grids BAT perrees Pont, atieieye erik Ser sgiggei! ; 
FIRST SERIES. -. (= . SECOND SERIES- _ 
Double altitude of the | Time of chronometer. Double altitude of the} Time of chronometer. 
sun’s lower limb. sun’s lower limb. 
Deg. min. h. min. — 3ec. Deg. min. s€c. h. min. sec. 
“a «413 20 8 62 08.0 41 656 40 8 6 61.0 
41 8S 83 ° 23.5 42 30 oe ST 28 
at. 02 6&5 8 250. 42: 20.20 8 57 560 
4l 23 30 8 6 . 3186 42 33 40 8 68 33.0 
41 40 50 8 66 08.0 43: 32-30 8 569 25.0 
Thermometer 65°. 
