TO YELLOWSTONE NATIONAL PARK, 41 
Determination of the latitude by observed double altitudes of Polaris off the meridian. 
Station, Camp Lowis, Montana.—Dato, July 25, 1875,—Rot. Circle, Gambay & Son, 212.—Chronometer, Bond & Son, 202.—Observor, Wood,— 
Computer, Wood.—Bur., 25'9.95.—Ther., 58°. 
Observed double altitudes. Corresponding times. 
Pe AE ht hom 8. log cos p == 9. 5393086 log sin p 9, 97228 
18 50 45.5 log A == 3, 6895752 log 4 3. 68958 
51 37, —— = 
52 44.5 log A cos p = 3, 228-838 log Asin p 3, 66186 
53 53.5 = 1694" - 
54 42, log (A sin p)? 7. 32372 
19 00 36, Op. See log a 4, 32454 
OL 30.5 Istterm = 28 14 log tan A 0. 02399 
02 30.5 Alt=A = 46 34 55 _—_- 
720 00 00 03° 19.5 2d term = 54 log 2d term — 1, 73225 
21L 55 00 19 04 08.5 > 2d term 54!’ 
<= —. Latitude = 47 04 03 
931 55 00 18 57 34.75 
93° 11 30 — 
4635 45 
50 
46 34 55 
50” 
1» 05" 364.1 
88° 38! 27" 
4393" 
hom 8. 
AR DP VATIG). isaac. aise tase ao ta iessigeetisiaicjeeraesient b Pa Vee Oman oem ee 1 12 59.65 
Siu. time at mean noon at this station........ 
* Sic. interval from mean time of culmination. 
Retardation of mean on sidereal time...... 
Mean time of evtUmination of star...... att 
Error of chron. at time of observation. ...-....22-. 22-02. eee eee eens 1 05 36.10 
Time by chron. of culmination...........2.2. 2220-0022 e een eee ee ee eee 2 18 35.75 
Clock-time of observation ...........2------acee cence ec cen eee eee ceceee 18 57 34.75 
Hourangle:-p; iavsid: Hm 6 sscsc0x sees cme came scczein seam secede w 7 “ar 01. 
sideves equivalentg@ it B20 .iccccceena we aeguvenspenaees permnenervens 110° 15’ 15” 
PIM APCs ideas ses icine's cba acwmenemae meee tecin PustaeeetaseeeteeTet 
Determination of latitude by circum-meridian altitudes. 
Station, Camp Lewis, Montana.—-Date, July 25, 1875.—Object observed, « Opbiuchi.—Sextant, Spencer Browning, 6536.—Index error, — 20’.— 
Chronometer, Bond & Son, 202.—Observer, Wood.—Computer, Wood.—Bar., 25i".95.—Ther., 58°. 
6W 
. . +9 Obs’d 2 cir- | Obs’d  alti- ; 
oe ie Mer. dist. Sent he cos l cos D |Red. to mer. gore: Sate a T a 6 alti- pa ee yas ia deduoed 
. =p: in arc=@. jan alti-| rected for | tudes=a. — a [== 90°4+ D—A. 
chron. =k rene tudes. index error. So 
Rh ™ t wa Ww € “a fo} ‘ “ oO t a oO t a“ fo} t “ ° * “ 
18 26 45,5 8 00.5 126. 2 27 111 07 30 55 33 35 55 33) «(01 55 35 28 47 03 39 
Q7 16. 7 30. 110. 2 08 08 40 34 10 33 36 
QT 44, 7 02, 97. 1 53 08 00 33 50 33 16 09 58 
28 10. 6 36. 85.5 1 39 08 50 340415 33° 41 20 47 
28 36.5 6 09.5 74.3 1 26 09 40 34 40 34 06 32 35 
29 14,5 5 31.5 60. 1 10 10 10 34 (55 34° 21 31 36 
29 45.5 5 00.5 49. 57 11 00 35 20 34° 46 43 24 
30 26. 4 20. 37. as 43 11 20 35 30 34 56 39 28 
30 54. 3 52. 29, 4 34 11 20 35 30 34° 56 30 37 
31 49.5 2 56.5 17. a 20 11 30 35 35 35 (01 21 46 
32 19. 2 27. 12, ef 14 11 30 35° 35 35 (01 15 52 
32 47. 1 59. 8. m4 9 11 50 35 45 35°11 20 47 
33 %2.5 1 23.5 4. a 5 12 20 36 00 35 26 31 36 
34 12.5 33. 5 0.6 s 1 12 00 35 50 35 (16 17 50 
34 53. a 0. 3 0 12 50 36 15 35 (41 41 26 
35 38.5 52.5 1.5 A 2 12 00 35 (50 35 (16 18 49 
36 16.5 1 30.5 4.5 4 5 12 00 35 50 35 16 Pal 46 
36 50.5 2 04.5 8.5 a 10 12 10 35 55 35 21 31 36 
37 30, 2 44. 14.7 a 17 12 00 35 50 35 16 33 34 
38 01.5 315.5 21. 8 24 11 30 35 35 35 (01 25 42 
38 35, 3 49. 28.6 o 33 11 00 35 20 34 46 19 48 
39 05. 4 19, 36. 6 42 10 50 35 15 34° 41 23 44 
40 18. 5 32. 60. 1 10 10 30 35 (05 34 31 41 26 
40 47.5 6 01.5 TU. 1 23 10 00 34 50 34 16 39 28 
41 39. 6 53. 93, 1 48 09 40 34 40 34 06 54 13 
42 10. 7 24, 107.5 2 03 08 00 33 50 33 16 19 48 
42 42.5 7 56.5 124, 2 24 08 00 33 50 33 16 40 27 
18 43 17. 8 31. 141.8 2 45! 111 07 30 55° 3335 55 33 «(01 55 35 46 47 03 QL 
MEAD... 0 cee eee e ee eee eee ner ete eee ee cette teeter nee eer e ee ewan e ee nnn nance ens erennenes gate cece ae prise 47 03 37 
Oo 4 a hom. &. Semi-diam. 
App. lat.=1 == 47 03 50. cos 9. 83326 Chron. correction 1 05 36 Refraction 34” 
Dec. = 12 39 07.4 cos 9.99932 A of * 17 29 10 Parallax 
a = 55 35 20. cos 0.24785 —_— 
, 18 34 46 
0. 07043 
