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Show [ 171]. 61U E:iUAMPM;~N·r AT FOR r J .. AR \ MIP., -1,470 pp,g·p A~OVP. TilE LEVEL OF Til& GlJJ,l'' 01" MEXlUO. Determination of longitude, .July 16, 1342-altilnde of tlte su 11• ODS}~HVATIONS. F lllS'T' fH: It 11; 1,. 8Jo:CO~ ll IH:RJ ES. Doubltl nltitutlc of tho Timr of chronometf'r. sun's lowN limb. Double nllitutlc of the Time of chronometer. sun's lower limb. Deg. mtn. sec. lt. ·mu1. sec. De g. mu1. ~er . h. mm. sec. 68 3l '20 9 40 21.0 60 12 21) 9 11 62.6 5H 58 tJO 9 tll ;):L5 60 37 50 9 46 01.0 69 18 30 9 J12 29.0 GO ,9 flO 9 46 ~4.0 69 28 10 !) 12 51.0 60 I)!) 20 !) 4() 59.0 69 45 00 y 43 40.4 6l 11 00 9 47 :J2.5 Thermometer Bl 0 . 3. Index crrot· ... + 25 sec. HE ' ULT OF CALCULATTON. Mean time. Au vance. Longitude. - -- ''· uun. sec. h. ""'"· stc. Dr g. mm. sec. 4 26 17 2 10 35 105 20 13 Deler~ninalion of longitude, July 18, 1842-allilude of a. .!lquilre. on-.:ERVA'I'IONS. -------------------------- l'lRS'r S!.:ttlES. S hCC\N I) 81\ Ill Y.S. Double altitude of a Time of chronometer. Doul,lo altitude of a Tirnc of chronomcwr. Aqui!ro Aquilrc. De !f. mn. sec. h. m1n. .'II! C. Dr g. rmn. sec. IL. min. ser. 79 :ll 10 I l 17 04.5 80 1)5 40 11 21 29 79 57 00 l l 18 25.5 81 21. 40 I 1 23 00 80 :i2 3() ll 20 18.0 Hl 47 20 ll 24 10 611 [ 174 ] ENCAMPMEN'r AT FOR·r I.ARA~IE, 1,470 FEET AUOVE THE LEVEL OF THE GULF 01'' Mt:;XfCO. Determination of laliltule, .July 18, l8,t2-a/litude of' Polaris. OR~EHVATIONS. Double altitude of Polaris. Time of chronometer. Deg. mtn. sec. h. 82 59 ntLn. lite. 10 ll 36 24 83 00 50 11 39 00 s :l 02 30 11 41 34 83 04 {)0 11 43 4:) 83 06 00 J 1 46 31 Thermometer 63°. Index error -. + 25 sec. RESULT OF CALCULATION. 'True altitude. Mean time. lAtlitudo. Deg. mw. uc. 41 30 38 1!. min. 8l'c. 9 31 11 D"!j· min. sec. 12 12 10 Determination of longit·ude, July 20, 1842-altitude of the sun. OBSERVATIONS. - .l'lRST SF.nu;s. 1n;coNn sEnu;s . - Double altituue of tho 'rime of chrouomct r. Doul,lc altitude of t.hc Time of chronometer. • lllln'slowcr limo. IHtu's lower limb. - - .- Dog. min. sec. "· 11/lll. IJ('C. Deg. min . SP.r . ft. 11LI.n, 8fC. 4U 1: l 20 8 f>2 08.0 4L 66 40 8 56 51.0 40 41 00 8 f):J 2:l 5 42 08 ::JO 8 67 2 t.G 41 02 55 8 f>1 25 0 4~ 20 :lO 8 57 fiG 0 41 23 30 8 65 21 () 42 :u 40 8 5-3 33.0 41 40 60 8 66 0~ . 0 I 42 52 20 8 o9 25.0 - I Thermometer 65°. Index orror - + 26 sec. |