C174 J 458 
ENCAMPMENT ON A TRIBUTARY TO THE LAKE AND HEAD WATER OF 
THE TLAMATH RIVER 
Determination of longitude, December 13, 1843—allitudes of a Lyre. 
OBSERVATIONS. 
FIRST SERIES. 
SECOND SERIES. 
Double altitudes of | Time of chronometer. Double altitudes of 
a Lyre. a Lyre. 
Time of chronometer. 
Deg. min. sec. h. min be. Deg. min. sec. kh. min.” see 
63 40 10 7 10 36.5 6L- 67° 00 7 15 49.8 
So te. 10 11 56.5 Gis. 38. BO © 16 444 
62 50 40 13. 04.0 61... 19. . 36 17 = 40.5 
62 13 61 OL 40 18 36.0 
62-114 --45 15 =03.7 60 . 44 00 19 30.0 
Index error = +- 1 min. 32 sec. 
RESULT OF CALCULATION. 
Mean time. Advance Longitude. 
=> 
he. min. sec. h. = min 
6 26 37 0 48 41.0 
Bint Emersion of Jupiter’s first satellite. 
Observed time. Mean time. Longitude. 
h. min . sec. he : min. 8éc. Deg. . min. Bec. 
6 5 18 21.6 12] 20. «42 
* 
