367 [ 174 J 
t ENCAMPMENT ON LARAMIE RIVER. 
Determination of longitude, July 31, 1843—altitudes of Arcturus. 
“ =. 
OBSERVATIONS, « 
FIRST SERIES. BECOND SERIES. 
Double altitudes of | Time of chronometer. Double altitudes of | Time of chronometer. 
Arcturus. | us. ol 
Deg. min. sec. h. min. sec. || Deg. min. sec. h. in. see. 
69 35. .40 10° 40 16.5 67 38 40 10 45 27.3 
69 pS eer) Al 18.0 66 49 50 47 36 3 
68 49 50 : 42 16.0 66 28 20 48 5 0 
68 20 50 43 39.5 65 46 10 50. 27:0 
00 00 Z *- Ad 30.4 (65-21 30 §1 30.5 
a 9 255: ~~ Index error '=+ 30sec, - 
- 
RESULT OF CALCULATION > 
Meary time. Advance. Longitude. 7 
eas ee 
kh. mins see. h. min. see. " Deg. min. see. 
40 26 ] 05 07.7 LOG. 16 54 
NOON HALT ON A STREAM DISCHARGING tes (A LAKE, 
‘Determindtion of latitude, August | 1, 1849—meridian altituilef the sun. 
BS ss OBSERVATION. Se ei ns 
aa sik 
Double altitude of the sun’s| . . True central altitude. Latitude. 
lo imb. 
- min. see. D: min. eg. ‘min. sec. 
= oe ee : - a 3 ---. 2 
ei i = ow ri i wp rs - 
wa os cs 
“ 
es a 
eae 
