Station, Camp Baker, Montana.—Date, July 31, 1875.—Sextant, Speucer Browning, 6536.—Chronometer, 
TO YELLOWSTONE NATIONAL PARK. 
43 
Determination of the time by observed equal altitudes of the sun’s limb, 
TO CORRECT THE CHRONOMETER AT NOON. 
Wood —Computer, Wood. 
Arnold & Dect, 1362.—Obse: ver, 
Corresponding times, onion Td a 
Observed t—t= [Equationof) Mn mee 
double alti- lapsed | equal alti- Supivon my 
tudes, timo, tudes = a, chil al et) 
— ee id - % 
A.M.=t P. M.==0 tudes. 
Oo Me hom 8 hom. 8. h. m. Ss. hom. 8. 
73 20 00 9 39 53.5 5 00 45.5 
40 07. 00 30.5 
40 23.5 00 «15. 
40 38. 00 00.5 
40 52.5 4 59 45.5 
41 07. 59 30.5 
41 24, 59 16.5 7 18 +9. 60 1 14 21.94 
41 37.5 59° O01. 
41 33. 58 45.5 
42 08.5 58 31. 
42 23, 58 (16, 
42 33.5 58 Ot. 
4 20 00 9 42 53, 4 57 46. 
9 41 23. 4 59 15,73 
hom 58. 
pee 7) 16m log A (page 164) = — 9. 4742 log B 9, 2355 16 59 15.73 
s&= 37”, 03 log é = — 1. 5687 log 6 — 1.5687 9 41 23. 
L= 46° 40’ 40” log tan = 0. 0254 logtan D = 9, 5182 26. 40 38.73 
ist term = +114, 70 —— —. 1320-19. 36 
2d term =e 28, 10 = + 1. 0683 == — 0. 3224 ae 9. 60 
a = + 9, 60 = equation of equal altitudes. 13° 20 28. 96 
12 06 07.02 
1 14 21.94 
Determination of latitude by circum-meridian altitudes. 
Station, Camp Baker, Montana.—Date, July 31, 1875.—Object observed, ©.—Sextant, Spencer Browning, 6536.—Index error, —50’.—Chro- 
nometer, Arnold & Dent, 1362.—Observer, Wood.—Computer, Wood.—Bar., 23in,20.—Ther., 85°. 
. 7 . Obs'd 2 cir- | Obs’d  alti- : eek 
arama se Mer dist. 2sin? § p cos J cos D |Red. to mer. cum-meri- tudes, cor- | True alti- sep ane ky 5! Lat. deduced 
oie, y =p. sin 1’, cus a. inarc= «a. dian alti- | rected for | tudes =a. a ee % | —9004D—A. 
enrOR: =k. tudes. index error. aps 
h m. 8. e ia “ a“ ° bd “ ° y “ ° t aw fo} a uw °o i. a“ 
110 37.5 9 51.5 190. 8 ( 4 QL} 123 33 10 61 46 10 61 30 OL 61 34 22 46 40 43 
1111.5 917.5 169.5 ' 3 52] 122 30 50 61 15 00 30 27 34 19 40 46 
11 43. 8 46. 151.0 3 25] 123 34 50 61 47 00 30 SL 34° (16 40 49 
12 12. 8 17. 134.7 3 04} 122 32 00 61 15 35 31 (02 34 06 40 59 
12 35.5 753.5 122. 2 2 50} 123 35 50 61 47 30 31 21 34 11 40 54 
13 01.5 T 27.5 109. 3 2 29) 122 32 50 61 16 00 31° 27 33 56 40 69 
13 42.5 6 46.5 90. 0 2 03} 123 37 20 61 4 15 32 06 34 09 40 56 
14 19.5 6 09.5 74.5 1 42 122 35 00 6L 17 05 32 32 34°14 40 51 
14 47.5 5 41.5 63. 6 1 27] 123 38 40 61 48 55 32 46 34 13 40 52 
15 22.5 5 06.5 51.2 1 10} 122 35 40 61 17 25 32 52 34 02 40 63 
16 03. 4 26. 38.6 53 | 123 40 20 61 49 45 33 36 34 29 40 36 
16 31. 3 58. 31.0 42 122 36 30 61 17 50 33 17 33 59 40 66 
17 06.5 3 22.5 22.4 a 31 123 41 00 61 50 05 33 56 34° 27 40 38 
17 47. 2 42. 14.3 s 20} 122 37 10 61 18 10 33°37 33°57 40 68 
18 15, 2 14. 9.8 ei 13 | 123 41 20 61 50 15 34 06 34 19 40 46 
18 45.5 1 43.5 5.8 roy 8} 122 37 50 61 18 30 33-57 34 05 40 60 
19 21.5 107.5 2.4 | 3] 123 42 10 61 50 40 34 31 34 34 40 31 
19 55, 34. 0. 6 rn 1] 122 38 10 61 18 40 34 07 34 «(08 40 57 
20 32. 3. 0.0 3 0} 123 42 00 61 50 35 34° 26 34 26 40 39 
20 58.5 29.5 0.5 Ss 1] 122 38 00 61 18 35 34 02 34° (03 40 62 
21 33.5 1 04.5 2.3 8 3} 123 42 00 61 50 35 34 26 34 29 40 36 
22 16. 1 47. 6.3 q 87 122 38 00 61 18 35 34 02 34 10 40 55 
22 44.5 2 15.5 10.0 s 14] 123 41 20 61 50 15 34 06 34 20 40 45 
23 23,5 2 54.5 16.6 a 23} 122 37 20 61 18 15 33 42 34 05 40 60 
23 55. 3 26. 23.0 ° 32} 123 41 10 61 50 10 34 01 34° 33 40 32 
24 32, 4 03. 32, 2 oS 44] 122 36 40 61 17 55 33 22 34° 06 40 59 
25 00. 4 31. 40.1 55} 123 40 40 61 49 55 33 46 34 41 40 24 
25 30.5 5 O15 49.5 1 08] 122 36 00 61 17 35 33 02 34 10 40 55 
25 56. 5 27. 58.3 1 19] 123 39 00 61 49 05 32 56 34°15 40 50 
26 21.5 5 52.5 67.8 1 33] 122 34 50 61 17 00 32 27 34 00 40 65 
26 52. 6 23. 80.0 1 49 123 37 «30 61 48 20 32 11 34 00 40 65 
27 24.5 6 55.5 94.1 2 09) 122 34 30 61 16 50 32. 17 34° 26 40 39 
27 57.5 7 28.5 109.7 2 30] 123 37 30 61 48 20 32 11 34 41 40 24 
28 29.5 8 00.5 126.0 2 52] 122 32 20 61 15 45 31 12 34 04 40 61 
29 11.5 8 42.5 149.0 3 24] 123 35 10 61 47 10 31 01 34° 25 40 40 
29 42.5 9 13.5 167 0 3 48 122 30 40 61 14 55 30 22 34 10 40 55 
30 12. 9 43. 185. 4 4 14] 123 33 20 61 46 15 30 06 34 20 40 45 
130 41.5! 1012.5 204.5 4 40! 122 29 20 61 14 15 61 29 42 61 34 22 46 40 43 
MSAD ccc wrein eres a ceiwawin se ped ale seiveieiale slices Serle dire ne enien wdoerewiersiecine dtigmiecietye Ge aibe:Saisisicbe Heelan wieiio ele 46 40 49 
f “ h mM. cm J “a Wn 
90 40 40 cos 9.83639 Chron. correction 1 14 21,94 Semi-diam. — 15 47.9 4 15 47.9 
18 15 05 15 05 cos 9.97758 Equation of time 6 07.02 Refraction — 24.9 — 24.9 
ee eeraaey a = 41 33 cos 0.32204 —_— Parallax + 4.2 +4 4,2 
108 15 05 a 1 20 28.96 — —_———— 
1.3677 0.13601 — 16 086 4 15 27.2 
