150 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 140. Date, March 6, 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. -j 
l 
r 
i 
East.. ^ 
l 
Direct__ 
Direct__ 
h. m. s. 
9 11 35.9 
o / 
97 30 
o / // 
1 42 36 
o / // 
95 47 24 
Reflection__ 
Reflection_ 
Reflection__ 
Reflection .. 
Direct-.... 
Direct_ 
9 13 32. 2 
97 59 
1 42 54 
96 16 06 
Reading of azimuth circle when plane of instrument is in the true meridian, by mean of two observations 
96 01 45 
Error of chronometer -J- 3 h. 22 m. 55. 3s. 
Station, Camp 142. Date, March 8, 1854. 
OBSERVATIONS ON POLARIS. 
Face of circle. 
Whether observatior s 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__-{ 
1 
l 
East __-j 
Direct. 
h. m. s. 
9 11 57.5 
O ' 
60 55 
o / " 
1 41 53 
o ' "• 
59 13 07 
Direct__ 
Reflection __ 
Reflection_ 
Reflection -_ 
i 
Reflection __ 
Direct_ 
9 10 26.5 
61 22 
1 41 29 
59 40 31 
Reading of azimuth circle when plane of instrument is in the true meridian, by mean of two observations 
59 26 59 
Error of chronometer -j- 3A. 25m. 05.5s. 
