42 
RECONNAISSANCE FROM CARROLL, MONTANA, 
Observation for time. 
Station, Camp Luwia, Montana.—Date, September 10, 1875.—Object observed, Arcturas —Sextant, Spencer Browning, 6536.—Caronometer, 
Bond & Son, 202.—Index error, 1/ 20’.—Observer, Wood.—Computer, Wood.—Bar., 25'».75.—Ther., 50°. 
fe} a “we 
Double altitudes observed. Corresponding times. Latitude =L = 47 03 50 
N. polar dist. = A == 70 10 00 
OF ee ho m 8. True altitude=A = 30 02 54 
60 40 00 20 02 08 — —— 
02. 37. 2m=L+A4A = 147 16 44 
03 (06.5 a 
03 36. ™m = 73 38 22 
04 05. m—A = 43 35 28 
04 35.5 
59 40 00 20 05 045 log cos m = 9. 4497575 
——— eee log sin (m—A) == 9. 8385388 
60 16 00 20 03 35.93 AOR 
log cos m sin (m—A) = 19. 2882963 
log cos L sin A = = 9. 8067069 
log sin? §p = 19. 4815894 
log sin 3p = 9. 7407947 
fe} y aw 
ap = 33 24 16 
p in are = 66 48 32 
hom. 8. 
p in time = 4 2 14.13 
RR = 14 09 58.65 
Equation of time = 
True time = 18 37 12.78 
Time by chron. = 20 03 35.93 
Chron. = 1 26 23.15 
Refraction =R = 1 26 
Parallax = P = 
Semi-diam.=Sd = 
R, P, and Sd = 
Observed 2alt. = 60 10 00 
Index error = 1 20 
2 alt. corrected =: 60). 08 40 
Altitude = 30 04 20 
R, P, and Sd = — 1 
Truealt.-A = 30 02 54 
log cos L = = 9, 8332634 
log sin A = 9,9734435 
ll 
log cos L sin A 
9. 8067069 
Determination of the latitude by observed double altitudes of Polaris off the meridian. 
Station, Camp Lewis, Montana.—Date, September 10, 1875,—Sextant, Spencer Browning, 6536.—Index error, —1/ 20’.—Chronometer, Bond 
& Son, 202.—Observer, Wood.—Computer, Wood.—Bar., 25i>, 75.—Ther., 50°. 
Observed donble altitudes. Corresponding times. 
Og ote ot hom. 8 log cos p = 8. 9318631 
93 50 30 20 14 34.5 log A = 3. 6HB4192 
SL 20 15 31. — 
52 00 16 35. log A cos p= 2. 6202829 
53 50 18 25. = AVL 
54 10 19 53.5 
55 10 20 32, Qo 6 ue 
55 40 20° 59. Ist term = 6 57.1 
56 (00 QL 37. Alt. =A = 46 55 55. 
56 10 22 12. Qhterm = 1 O13 
5630 22. 38.5 ens 
56 40 23 05. Latitude = 47 03 53 
57 10 23° 45.5 
93 57 30 20 24 17.5 
93 54 49 20 20 19.96 
1 20 
9353 29 
46 56 45 
50 
4655 55 
BR POlATIG coos. e sae aie we pea eemew swan eyeade es pamgeke seeEweeeeteete ened 
Sid. time at mean noon at this station....... 
Sid. interval from mean time of culmination. 
Retardation of mean on sidereal time ...-... 
Mean time of culmination of star ..... 
Error of chron. at time of observation...................s2ss0ss0eeeee 
Time by chron. of culmination 
Clock-time of observation...-. 
Horan gle, 9; sid tiMs ce essed sadce emcooos mace nbaade ase aseaar 
Bidereal equivalents 1) alCisenevaeweateans ress cuswansaasamen wn wae 
PIN BTC sie eseisiee cent cis sieaiaisislsisialaieesale: siniisieiistmed wueecime nee eRe 
log sin p 9. 99841 
log A 3. 68842 
log Asin p 3. 68683 
log (As in p)? 7. 37366 
log a 4. 38454 
log tan A 0.02931 
log 2a term 1, 78751 
2d term 61.3 
50” 
1) 26m 238,15 
88° 38’ 40” 
4880" 
hom 8. 
1 13 33.66 
1 26 23.15 
2 39 56.81 
20 20 19.96 
6 19 36.85 
94° 54’ 13” 
