633 
[174] 
ENCAMPMENT AT MOUNTAIN LAKE, 7,200 FEET ABOVE THE on OF 
THE GULF OF MEXICO. 
OBSERVATIONS. 
Delrnination of longitude, dugust 17, 1842 ald | the sun. 
FIRST SERIES. 
SECOND SERIES. 
ae 3 of w% os , 
Double altitude ‘of the | ‘Time of chronometer. Double altitude of the |. Time of chronometer. 
sun’s lower linn. Ps | sun’s lower limb. 
min. ~ sec. h,’ min. sec. || Deg. min. h. see. 
02 15 5 54 48.0 Al 5 31.4 
20 5 36.3 42 ol 6 12.0 
35 15 5 17.0 42 18 6 r Be 
48 35 5 54.0 || 42 38 6 53.0 
17 20 5 106.5 {| 42 50 6 3 
Thermometer, 62°.” 
Index error = — 32 sec. 
RESULT OF CALCULATION. 
Mean time. oy , Retard. : Longitude. 
aust = 7) 1842—aliitude of the sun in the meridian. 
di 
sh to teadT lott too a | OMSERVATIONS.. bt beh to ul a 
Double altitude ¢ ‘the sun’s True. central altitude. 4 Latitude. a 
6 £0 eT ; 6! i g.£0 i i‘ a! 38. 
ee ? is ee Pid f = Las ‘on 
i. Cae Toe a ¥ 6 +) 
Deg min. see. Deg min. ' see, Deg. 
120. 38 15 34 22 42 
FXILD 2O PiveaL ag 
rion Srna i, 
Fugtio ru | a oh j metti nel 
- ree ae Se ms 
#2 of t ' & .) 
. ee ss: : 
