TO YELLOWSTONE NATIONAL PARK. 47 
Determination of the latitude by observed double altitudes of Polaris off the meridian. 
Station, Camp Baker, Moutana.—Date, August 4, 1875.—Ref. Circle, Gambay & Son, 212—Chronometer, Bond & Son, 202.—Observer, Wood.— 
Computer, Wood.—Bar., 25',22,—Ther., 579, 
Observed double altitudes. Corresponding times. 
ne hom 8 log cos p == 9,2947207 log sin p 9, 991395 
19 37 17. log 4 = 3, 6893977 log A 3. 689398 
37 59.5 —. oe 
38 48. log A cos p = 2, 9841184 log Asin p _—3, 680793. 
39 26. = 964.1 —_— 
39 58.5 log (4 sin p)? 7.36159 
40 32. Or Rk a log a 4, 38454 
41 17.5 Ist term = 16 04.1 log tan A + 02125 
41 53, Alt =A = 46 24 05. ——_— 
208 17 00 42 25. 2d term = 58,5 log 2d term 1, 76738 
720 00 00 19 42 56. — 2d term 58.5 
— — Latitude = 46 41 07.6 
10) 928 17 00 19 40 15.25 
92 49 42 
46 24 51 
~ 46 
46 24 05 
46’ 
1b 12m 35¢.65 
88° 38/ 29/ 
4891” 
hom 8. 
PR POAT IS iai.c:ns cian Soe scieie' ie: ti Saisenaaiosavnsisismsmemdmameeean sas weeeeeee 1 13 08.00 
Sid. time at mean noon at this station. ....-. 
Sid. interval from mean time of culmination. . 
Retardation of mean on sidereal time...... 
2 Mean time of culmination of star -... 
Error of chron. at time of observation . ........--.--..22. eens eee eee 1 12 35,65 
Time by chron. of culmination .........22. 22.00 -2 eee eee eee eee ee 2 25 43. 65 
Clock-time of observation .....-. 1.22. ...202 eee eee eee eee eee eee eee 19 40 15.25 
Hour-angle, p, in sid. time .-..-...- 20-22 ee eee eee eee eee eee ee 6 45 28 4 
Sidereal equivalents in arc. .-.....202 6. ee eee ee ee eee e eee ee eee 101° 22’ 06” 
p lib OFC aseseenseececusseney Metexeeowsameracuadnieeeracneeeeeeakeeee cs 
Determination of latitude by circum-meridian altitudes. 
Station, Camp Baker, Montana.—Date, August 4, 1875.—Object observed, 7 Serpentis.—Sextant, Spencer Browning, 6536.—Index error, — 30”.— 
Chronometer, Bond & Son, 202.—Observer, Wood.—Computer, Wood.—Bar., 25!»,22,—Ther., 579. 
Ra . : Obs'd 2 cir- 
eae ee Mer. dist. Sein" 42 cos Z cos D |Red. to mer.| cum-meri- 
c fae y =p. sin 1 cos@.|imarc=a.| dian alti- 
enron: = tudes. 
h mM. 8. y “a aw “ fo) Z “ 
19 23 18.5 4 10.5 34.3 es 80 49 00 
24 07, 3 22. 22.3 ri 49 00 
24 49. 2 40. 14.0 a 49 00 
25 37.5 1 41.5 5.7 8 49 10 
26 42.5 46.5 1.2 3 49 10 
27 19.5 09.5 .0 iy 49 30 
28 01. 32. 6 a] 13 49 30 
28 42. 1 13. 2.9 | 49 20 
29 19. 1 50. 6.6 ney 49 10 
30 04.5 2 35.5 13, 2 EB] 49 00 
30 46, 317. 21.2 $ 49 00 
31 24, 3 55. 30. 1 g 48 10 
19 32 11, 4 42. 43, 4 to) 80 47 40 
15.0 80 48 58 
30 
80 48 28 
40 24 14 
57 
40 23 17 
13 
40° 23 30 
87 04 12 
46 40 42 
oF au" hem. 3 Semi-diam. 
App.lat.=l= 46 40 40. cos 9.83648 Chron.correction 1 12 35.65 Refraction 57” 
Dec. =S§8. 2 55 48.3 cos 9. 99943 KR 18 14 53,22 Parallax 
= 40 2 20. cos 0. 11824 pee eee eee 
* 19 27 28.87 
. 879 9, 94415 
