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Show [ 243] 124 Enca'llt;Jmvnt at E~brt Laramie, 4,4 70.feet above the level l!f tlte Gulf of Me:t·zco. DETERMINATION OF LONGITUDE. July lo, 1842.- Altitude of the Sun. Observat im1 s. FIRST SERI&s. sz~oNo st:au:s. Doubjc altitude of the Time of chr<>Dometer. \:o's lower limb. ---------- Double altitude of the Time of chronometer. Sun's lower Jimb. --- l.rg. mi11. sec. h. Ill i ft. sec. clrg. ~)8 min. sec. h. 'Ill iII. rr. :~1 20 9 40 21.0 GO 12 20 9 4~ 52.5 !>tj ~;8 40 9 41 33.5 GO 37 50 9 46 01.0 59 18 30 9 42 ~9 . 0 60 49 50 9 46 34.1 !)9 28 10 9 42 54.0 60 :)9 20 9 46 59.() 59 45 00 9 43 40.4 61 11 00 9 47 32.5 - ---- --··--·--... -- Thermometer 81 ° .3. Index error = + 25''. Result f:!( calculation. -- Mean time. Advance. Longitude. 1:. mitl. uc. lt. min. SiC. d.i•g. min. sec. 4 2G 17 2 10 35 105 20 13 DETERMJNATlON OF l~OKGITUDB. • July 1 , 1 84'2.-Aititude of a Aquila~. Observat·ions. FIRST ERIF.S. St:CONO SJ-:Rtt:s. , Double al titude of a Time of chronometer. Double altifude of u Time of eh ron ometcl'. Aquil:e. I Aquila.:. I - -~---1-------- ~trg. min. sec. h. min. sec. dcg. 11U71. sec. h. Ill ill. 79 31 10 ll 17 04.5 SI'C. 79 57 00 80 55 40 11 21 29 11 18 25 .5 81 24 40 11 23 00 t!O 32 30 ll 20 H3.0 I 81 47 20 11 24 10 R esult of calculation. . Mean time. Advance. Longitude . h. min. sec. h. min. 9 10 46 2 sec. 09 58 ...................... 125 b'ncampmcnt at F'ort Lararnie.-Continucd. DETERl\HS.\TION OF LATITUDE. July l , 1842.-Altitude of Polaris. Observatious. Double altitude of l'o- Time of chronomctor. lari ' . dtg. mi.n. sec. "· min. ~rr. ~:.! 5!) 10 ll 36 ~?4 8:i uo 50 11 39 00 83 ()2 30 Jl 4L 34 ti3 04 50 11 43 ~5 83 06 00 11 45 31 ----~- 'l'hcrmometcr, 63° . Index error,==+ 25". Result of calculation. True altitudt~. Mean time. Latitude. dt·~. m?.u. src. h. min. sec. dP';• mh1. 41 30 Jtl 9 31 14 4~ 12 DET~TIMINATION OF LONGIT GDY.. July 20, 1 4.2.-Altitude of the Sun . Observation,~. ,-·---- ---------·------- [ 243] ,S('('. to Double altitude of the Time of chronometer. Doubl<' altitude of the Time of chronometet'. Sun's •l ower limb. Sun's lower Jimb. ----~--- de~. mil!. sec. h. min. :J?t- (/r~. Ill iII. ser. h. mi It . $CC. 5G 40 8 56 51.() 40 13 20 ~ 5~ 08.0 41 -40 41 00 8 53 ~5.5 42 08 30 8 57 23.~ 41 02 55 8 54 25.0 42 20 20 8 51 !if>.() 4L 2:l 30 8 55 21.0 4:2 33 40 8 5 3l.(t 41 40 50 8 !)6 08.0 42 52 20 8 5() 25.0. Thermometer, 65°. Index error, == + 2t:v:: '' · |