APPENDIX L.—ASTRONOMICAL OBSERVATIONS. 
147 
ASTRONOMICAL OBSERVATIONS—Continued. 
Observations for the variation of the compass, April 24, 1854.— 
Double altitude of Polaris, in the west. 
Time. 
Altitude. 
Magnetic bearing. 
h. m. s. 
7 32 45 
d. m. s. 
63 43 10 
d. m. s. 
N. 12 30 00 W. 
Variation of compass, E. 11° 49'. 
Double altitude of Spica Virginis, in the east. 
Time. 
Altitude. 
Magnetic bearing. 
8 51 28 
d. m. s. 
84 00 10 
d. m s. 
S. 40 00 00 E. 
Variation of the compass, E. 10° 55' 40". 
Thermometer 55° Fahrenheit. 
T CAMP ON WEST SIDE OE THE BRAZOS, OPPOSITE 
EORT BELKNAP. 
DETERMINATION OF LATITUDE. 
Double altitudes of Procyon, in the west. 
125 08 20 
125 02 30 
Thermometer 62° Fah. Clouds in the north obscured Polaris. 
Determination of latitude, April 26, 1854 .—Double altitudes of 
Spica Virginis, in the east. 
Thermometer 62° Fahrenheit. 
Thermometer 62° Fahrenheit. 
