* 
Pee hy { 174-7, 
: Si . 
ENCAMPMENT ON PYRAMID LAKE. 
Determination of longitude, January 12, 1844—altitudes of « Cygni. 
OBSERVATIONS. 
= 
FIRST SERIES. | ¥ SECOND SERIES. 
: *Dovble altitudes-of PTithe-of ‘chronometer. Double altitudes of | Time of chronometer. 
: a Cygni. a Cygni. | 
Deg. min. see. h. min. set. Deg. min. se h. min Cc. 
3 59 .,00 6 45 14.45 62 3 . 25 C2. ol 08.5 
63 34 060 46 31.0 61 52 05.5 
15 50 4724.0 6 28 45 52 53.0 
6 39 49 14.5 Gl. OF BU 53 59.0 
G2 -20= 25 50 =—-14.0 60°. 43°... 16 54 59.0 
= Index error int + 43 sec. 
RESULT OF CALCULATION. 
Mean time. Advance. | ~ Longitude. 
| 
| 
- Determination of latitude, January 12, 1844—altitudes of Polaris. 
* 
OBSERVATIONS, 
: r } os 
Double altitudes of Polaris. Time of chronometer. 
we min.  $€C. h min. sec. 
8 22 650 oe a 
83 22 40 ‘ 01 39 
83 22. 30 «2: SS 
oe aS es | 19 
; a t: < #0 eo 
21 15 | 42 
oe ws 60 07 46 
oo 21 00 | 0s 46 
83 .20 0 Oo. + sd 
83 2 25 i. st 
: Index error = + 43 sec. ® ee 
a sce __. RESULT OF CALCULATION. — 
True altitude. * Mean time? 
a 
ee: 
