y124.) | 606 ; 
ENC: AMPMENT AT ST. VRAIN’S FORT, SOUTH F F PLATTE RIVER, 5,440 
FEET ABOVE THE LEVEL.OF THE GULF OF MEXICO. 
Determination of longitude, July 11, 1842—altitude of the sun. 
OBSERVATIONS. — 
FIRST SERIES. — ; SECOND SERIES. 
Double altitude of the | ‘Time of chronometer. || Double altitude of the | Time of chronometer. 
sun’s lower limb. , : * gun’s lower limb. . 
» min. see. Be 2inin. see. Deg. min. see. “he min % 
OL. 9 18 = 23 5: oo 00 oS 2 17.0 
50 34 —_— =: 53 36 65 9 53.5 
Sl 01. os >. SE. oar ee Fe 20 9 40.0 
3 eee << ieee 5 9/22 13 54 48 #15 o St O20: 
02 55 9. 23-45 55. - 2h» 30 9 32 30.0 
Index ertor = + 15 sec. 
_ RESULT OF CALCULATION. 
* a : 
Mean time. | Advance. . Longitude. | 
“he min. see. | hk. min. * se Deg. min. sec. 
. Bigs ee : 2 138-0 23 105 45 #13 
Determination of longitude, July 12, 1842—altitude of the sun. 
OBSERVATIONS, 
sun’s lower limb. sun’s lower limb. 
Deg. min. see. h. min. see. | Deg. min. see. he min. 
62 33 10 Sm wt 66 09 30 i. 0 
27 =—-20 > oO 67 09 30 10 6040 55 5 
63 OF otis. t 9 55 32 hte 
48 00 9 57 45 
es Ne a 
: a ee ae 
