46 RECONNAISSANCE FROM CARROLL, MONTANA, 
Determination of latitude by cireum-meridian altitudes. 
Station, Camp Baker, Montana.— Date, August 3, 1875.—Object observed, ©.—Sextant, Spencer Browning, 6536. Index error, — 25’.—Chro- 
nometer, Arnold & Dent, 1362:—Observer, Wood.—Compnater, Wood.—Bar., 25'",20.—Ther., 86°. 
. +9 Obs’d 2 cir- | Obs’ alti- ; 
one Oe Mer. dist. Janie coslcos D |Red.tomer.| cum-meri- | tudes, cor-| True alti- gat apy hey Lat. deduced 
oven Y) =p. sin 1! cosa. |ibare=a.| dian alti-| rected for| tudes =a. 4p A. | | =90°+D—A. 
° =k. tudes, index error. =e 
h. ™m. Ss. ou aa V “ fe} ¥ aw ° t “ fe) v er fo} t aw fe} ra “ 
112 59.5 7 20 105. 6 2 26] 122 05 00 61 02 17 61 46 07 61 48 33 46 40 38 
13 28.5 6 51 92.1 2 O07 | 121 02 20 60 30 53 46 25 48 32 39 
13 53.5 6 26 BL.3 1 53 | 122 06 00 61 02 47 46 37 48 30 41 
14 24.5 5 55 68.7 1 35); 121 038 10 60 31 23 46 50 48 25 46 
14 51.5 5 28 58. 7 1 2i 122 07 «00 61 03 17 47 07 48 28 43 
15 23. 4 56 47.8 1 06} 121 04 10 60 31 53 47 20 48 26 45 
16 01. 418 36.3 a 50 | 122 08 10 61 03 52 47 42 48 32 39 
16 32. 347 28.1 2S 39 | 121 05 00 60 32 18 47 45 48 24 47 
17 00. 319 21.6 23 29 122 08 40 61 04 07 47 57 48 26 45 
17 27.5 2 52 16.1 ay 22} 121 05 30 60 32 33 48 00 48 22 49 
18 04.5 215 10. 0 2 14 122 09 40 6L 04 37 48 27 42 41 30 
18 28, 151 6.7 a 9 121 05 30 60 32 33 43 00 48 09 62 
19 00.5 119 3.4 s 4 122 09 50 6L 04 42 43 32 48 36 35 
19 30.5 49 1.3 s iL. 121 06 20 60 32 58 48 25 48 26 45 
20 00.5 19 0.0 a 0 | 122 09 40 61 04 37 48 27 48 27 44 
20 30.5 11 0.0 ia 0] 12t 06 10 60 32 53 48 20 48 20 51 
21 52.5 1 33 4.7 3 6 | 122 09 20 61 04 27 48 17 48 23 43 
22 37. 218 10.4 # 14} 121 05 40 60 32 38 48 05 48 19 52 
23 09. 2 50 15. 8 3 22] 122 09 00 6L 04 17 48 07 48 29 42 
23 34, 3.15 20.7 o 29 121 05 20 60 32 28 47 55 48 24 47 
24 03. 3 44 27.4 38 122 08 20 61 03 57 47 47 48 25 46 
24 36. 417 36. 0 50 | 121 04 50 60 32 13 47 40 48 30 41 
25 08. 4 49 45.5 1 03; 122 07 40 61 03 37 47 27 48 30 41 
25 50. 5 31 59.8 1 22} 121 038 30 60 31 33 47 00 48 22 49 
26 42.5 6 23 30.0 4, 31 122 06 10 fil 02 52 46 42 48 33 8 
27 14.5 6 55 94. 0 2 10 121 02 00 60 30 48 61 46 15 61 48 25 46 40 46 
Mea nilasaicsdcceiendecasndcaaniestiecunetoues yer ect Sotieah sae cabiee teat ae Sear eaenraesininn Goeeece nk Reims siaerae ace 46 40 44 
° td “ he an. ss ‘ a“ i a“ 
90 00 00 App.lat=I = 46 40 40 cos 9.83648 Chron. correction 1 14 238.7 Semi-diam. — 15 483 + 15 48.3 
17 29 121 Dec. = 17 29 11 cos 9.97945 Equation of time 5 55.5 Refraction — 25.6 — 25.6 
a = 61 48 cos 0.32555 —_— ——. Parallax + 43 4 4.3 
107 29 11 1 20 9.2 —_——_ —_— 
61 48 33 1.385 0.14148 — 16 09.6 +4 15 27.0 
46 40 38 
Determination of latitude by circum-meridian altitudes. 
Station, Camp Baker, Montana.—Date, August 4, 1875.—Object observed, a Ophiuchi—Sextant, Spencer Browning, 6536.—Chronometer, Bon 
& Son, 202.—Observer, Wood.—Computer, Wood.—Bar., 25'», 22.—Ther., 57°, 
' ' A ’ 
Times of obs. |Mer. dist. ism ie cos 1 cos D |Red. to mer. diy ae 
by chron. = mae cos a in arc= «a. tuiles: 
h ™. Ss. v oF a“ : uw oO v “ 
18 31 34. 10 12. 204. 2 ( 111 50 40 
32 20. 9 26. 174.7 51 30 
33 07.5) € 38.5 146. 6 53 00 
33 51. 7 55. 123.1 53 50 
34 32.5; 7 13.5 102.5 54°50 
35 (09. 6 37. 86. 0 55 20 
36 11. 5 35. 61.2 é 56 00 
37° 14.5] 4 31.5 40. 2 coy 56 50 
38 (06, 3 40. 26. 4 a 57 30 
38 43.5] 3 02.5 18, 2 a 58 00 
39 22, 2 24, 11.3 xe 58 10 
40 13. 1 33. 4.7 yer 58 20) 
41 00.5 45.5 Tot S 85.1 58 «50 
41 53.5 07.5 0.0 3 : 58 20 
42 54. 1 08. 2.5 A 58 30 
43 51.5] 2 05.5 8.6 1 58 «20 
44 385] 2 52.5 16.2 8 58 10 
45 25. 3 39. 26.2 S 57 50 
46 10. 4 24, 38. 0 iS) 56 40 
46 55.5 | 5 09.5 52.3 o 56 20 
47 32.5] 5 46.5 65. 5 56 00 
48 16. 6 30. 83. 0 55 10 
48 53. 7 07. 99.7 54 20 
49 31, T 45: 117.9 54 00 
50 34.5) 8 48.5 152. 3 52 30 
18 51 32. 9 46. 187. 3 111 51 50 
ey MSS 2 
in 5448 
55 57 24 
32 
55 56 52 
1 25.1 
55 58 171 
102 39_ 08. 6 
46 40 51.5 
Of hom 8 
App. lat.=1= 46 40 40. cos 9.83648 Chron. correction 1 12 35.65 Semi-diam. 
Dec. = 12 39 08.6 cos 9.98932 * AR 17 29 10.38 Refraction — 32” 
a = 55 57 cos 0, 25188 Parallax 
-—— Equation of time 18 41 46,03 
1.196 0. 07768 
