MAGNETIC OBSERVATIONS. 
137 
OBSERVATIONS—Continued. 
Station, Camp 121. Date, February 13, 1351. 
OBSERVATIONS ON POLARIS. 
Face of circle. 
Whether observations are 
direct or by reflection. 
Time of observa¬ 
tion by chrono¬ 
meter No. 10. 
Reading of 
azimuth cir¬ 
cle. 
Computed azi¬ 
muth of Po¬ 
laris. 
Reading of azimuth 
circle when plane 
of instrument is in 
the true meridian. 
West.. | 
l 
r 
East. 
[ 
Direct_ 
h. in. s. 
7 44 07.9 
O ' 
72 27 
o ' " 
* 1 24 48 
o ' " 
71 02 12 
Direct_ 
Reflection __ 
Reflection __ 
Reflection__ 
Reflection __ 
Direct_ 
Direct_ 
7 43 12. 3 
72 53 
1 24 34 
71 28 26 
Reading of azimuth circle when plane of instrument is in the true meridian, by mean of two observations 
71 15 19 
Error of chronometer -)- 37?.. 10m. 22. 4s. 
Station, Camp 122. Date, February 15, 1854. 
OBSERVATIONS ON POLARIS. 
Face of circle. 
Whether observations are 
direct or by reflection. 
Time of observa¬ 
tion by chrono¬ 
meter No. 10. 
Reading of 
azimuth cir¬ 
cle. 
Computed azi¬ 
muth of Po¬ 
laris. 
Reading of azimuth 
circle when plane 
of instrument is in 
the true meridian. 
r 
West.. \ 
Direct_ 
h. m. s. 
7 17 22. 6 
O ' 
78 45 
o ' " 
1 16 18 
O ' " 
77 28 42 
Direct_ 
Reflection_ 
Reflection_ 
f 
East_ __ -J 
Reflection.. 
Reflection_ 
Direct_ 
l 
Direct_ ' _ 
7 19 03 
79 20 
1 17 40 
78 02 20 
Reading of azimuth circle when plane of instrument is 
in the true meridian, by mean of two observations. 
77 45 31 
18 m 
