50 RECONNAISSANCE FROM CARROLL, MONTANA, 
Determination of the latitude by observed double altitudes of Polaris off the meridian. 
Station, Camp Baker, Montana.—Date, August 5, 1875.—Ref. circle, Gambay & Son,.212.—Chronometer, Bond & Son, 202.—Observer, Wood.— 
Computer, Wood. —Bar., 25!". 30,—Ther., 53°. 
Observed double altitudes. Corresponding times. 
aes am h. mm. 8. log cos p = 9.3227046 log sin p 9. 99018 
19 34 18.5 log 4 = 3. 6893977 log A 3. 68940 
34 48, —_-—- —_—_—- 
35 31 log 4 cos p= 3. 0121023 log Asin p 3. 67958 
36 30. = 1028.3 —_— 
37 06.5 —_—__— log (A sin p)27. 35916 
37 37.5 oj: " log a 4, 38454 
38 08.5 1Istterm = 17 08.3 log tan A .02091 
38 44, Alt.=A = 46 22 43.2 —_—_—_—_- 
207 50 00 3917.5 2d term 58. 2 log 2d term 1.76461 
720 00 00 19 39 57.5 ———_— 2d term 58.2 
pa S eri d Soe Latitude = 46 40 49.7 
10) 927 50 00 19 37 119 
92 47 00 
46 23 30 
46.8 
46 22 43.2 
Refraction 46.8 
Chron. correction .. 1h 12m 35%.8 
Dec 88° 38/ 29/7 
Azecexprosssis sane cea caraeneamasiuess ocncceensaccvek cexesevesmeeecseks 4891!" 
hom  s. 
AE POLATIS ssc sete ac ccaneecdces oh mee Gaon wen awemscrstnsessieese ue mseaie 1 13 08.76 
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 ........22.. eee ee eee ee eee eee 1 12 35.8 
Time by chron. of culmination.......... 0.00022 cence ence ce cee rene eee 2 25 44.56 
Clock-time.of observation sais ecccccesncsesis ceed ec cccce nese eusimencts « 19 37 11.9 
HMoursan gle, im Mean: tM Os seis asreiesinnsecreis soarreiee sciesyeaig cae siete earoee 6 48 32.66 
Sidereal equivalents in ate. cas ssccewcarsceenscecscesess coe sea veces 102° 08’ 10” 
Pr AMAT Cs, < aiuiciaikycejominaleins sic cisiacuseaicceGieeleae Wiafciala/e.aaarctovataceataticie ealsiaiein cate 
Determination of the latitude by observed double altitudes of Polaris off the meridian. 
Station, Camp Baker, Montana.—Date, August 5, 1875.—Soxtant, Spencer Browning, 6536.—Index error, —60’.—Chronometer, Bond & Son, 
202.—Observer, Wood.—Computer, Wood.—Bar., 25's, 30.—Ther., 53°. 
Observed double altitudes. Corresponding times. 
Oe i ot hom 8. log cos p = 9. 4822605 log sin p 9. 97901 
92 30 30 19 11 51.5 log A = 3. 6893977 log 4 3. 68940 
31 10 12 44 —_— 
31 20 13° 24.5 log 4 cos p == 3, 1716532 log Asinp 3.66841 
3L 50 14 (00.5 = 1484.8 —_—- 
32 10 14 40 —— log (A sin p)? 7. 33682 
32 40 15 23 Oo fut log @ 4, 38454 
33 20 16 10.5 Istterm = 24 44.8 log tan A 0.01896 
34 00 16 49.5 Alt= A = 46 15 00.7 — 
34.15 17 21.5 2dterm = 55. 0 log 2d term 1. 74032 
92 34 35 19 18 06.5 —_—— 2d term 50”. 0 
——_—— —— Latitude = 46 40 40.5 
92 32 35 19 15 03,25 
1 00 
92 31 35 
46 15 47.5 
46.8 
46 15 00.7 
Refraction :sccoccsacoswponacnaedy seccasexese cess se erseseseeseescews 46.8 
Chron. correction 1h 12m 35%. 8 
ANC Citta cierete ocala nisyatecsise 2:3, 88° 38/ 290” 
LS cs Beanie aigcavaca aie veissairere eva talc och ararea a aid eaaienae aleve vaneicide Sip staee hese eats ok eae 4891” 
hom. 8. 
BY POLIS ois wise ’sainers ataeneclasemente vest gactslocionensinessdeinaacingsisciexa 1 13 08.76 
Sid. time at mean noon at this station.......-2..-2. 2-2 .ee eee eee cee 
Sid. interval from mean time of culmination ....-.....2..22.-00.-eeee 
Retardation of mean on sidereal time .-.-.. disGerUserenseaoMe manele 
Mean timo of culmination of star * 
Error of chron. at time of observation ...... 022.22 eee eeee ee eee ences 1 12 35.8 
Time by ‘chron. of culmination s..<s00c00 ssa scesencinesciseses sxcorsaws 2 25 44.56 
Clock-time: of ObSOr VATION. 26. denciciciewiecineicicide na cinecineicescanatsncee 19 15 03.25 
Hour-angle, p, in sid. time 
Sidereal-cquivalents 10: ALC. siceimcreinsie sis wcic oonia sec eacieciesicianeveani oss 
DAN AG eeca sv aadstes meciweswesateasicteds cance ich ncspieaawiaaniE ces nes 
7 10 . 
107° 40’ 20’ 
41.2 
