457 [174] 
ENCAMPMENT AT TLAMATH LAKE, 
* 
Determination of latitude, December 11, 1843—altitudes of Polaris. 
OBSERVATIONS. 
Double altitudes of Polaris. Time of chronometer. 
Deg. min. sec. h. min, sec, 
88 41 30 7 Zz 
8s 41 20 oe ee 
88 41 30 02 59 
88 2 4] 53 469 04 22 
88 42 10 05 «42 
Index error = +- 1 min, 32 sec. 
ae 
RESULT OF CALCULATION. 
True altitude. Mean time. Latitude. 
Deg. min. sec. h. min. sec. Deg. min, sec. 
44 20 35 ae Rae | 42 56 47 
oe 
Determination of longitude, December 11, 1843—altitudes of « Lyre. ? 
OBSERVATIONS. 
FIRST SERIES. SECOND SERIES. 
‘ = : x a ¥ 3 pd ; : re, 
Double altitudes of | Time of chronometer. || Double altitudes of | Time of chronometer. 
a Lyre. Lyre. 
2 aa 
Deg. min. sec. h. min. sec Deg. min. sec. h. 
67, 34° 7-09 055 66°. 58: 45 7 238 8E3 
06 10 10. 2&7 65°. -S 56.6 
47 40 It. 23.0 65.-- 18 Se: 15. 44.8. 
66 382 40 12 07.5 65 03 20 16 34.5 
66 15 50 12 56.5 64... 42 : 26 a4; 36.8 
Index error = ++ 1 min. 32 sec. 
RESULT OF CALCULATION. 
Mean time. Advance. Longitude. 
h. min. see. * = ee. 
6 22 44 a 0 50 43.5 
