{Vol. IX. Pari /.—p. 234.; 



Taule II. 



Cireum^cridian Observations made at Makcrstown, lOlh FcbRiary 1820, in urdc-r to dctemu"^' '''^' I-aiitudo, and ivilli a View of ascertniiiiny thv Accuracy that may Ijc obtftiued by tbat Mude of observing— Longitude in Time west of Greenwich nearly 10' 4". Quicksilver Horizon, covered by one of Troughum's 

 Glass Roofs. 



Noon by Clironometcr. 



Numbers corresponding to horary angles, 



Logariilims, 



Constant factor, or l,og.f. 



Constant factor + Log. of numbers, 

 Corrections, 



67.96 ■ 



1.83225 

 976460 



1.59685 

 39.S 



O'fl declination corrected for different meridians, D = 14 35" 39.3- 

 CorrectJoiis for horary angles, - . + 4.7 



D corrected, 



Altitudes corrected for errwr of instrument, 

 SemMiiameter -J- Parallax — Refraction 

 Reduction to noon. 



Co-Iatltudes, or height of equator. 

 Latitudes 



34 35:0.0,.: 



m 34'iao-" 



39.17 

 I.,?9295 

 976460 



21.38 11.15 



1.3300! 1.04727 



970*61 9.70*60 



0.03548 

 9.76460 



0.16 



9.20412 

 9.7640O 



I.>>g.y = 



Co-sine H Co- sine D 

 Sine (H + D) 



Formula for Log. /^ 

 H = 55 34 32 Co-slnc 9.75229 

 D = 14 35 79 Co-sine 9.98576 



ir-l- D = 70 10 11 Ar. Co-sine 0.02065 



Log. / = 976460 



1.83 

 0.2624S 

 9.70400 



7.99 

 0.90255 

 976*00 



10.51 

 1,21775 

 976*60 



27.37 

 1.43727 

 976*60 



0"s declination nt noon by Epheraeris, - = 11 36 48 



10' 4" west of Grcenwicli, - - — 8.7 



Declination corrected for diiference of meridians, 14 35 39.3 



Barometer, 

 Thermometer, 

 Zenidi distance. 



For die refraction. 



: 0.7495 = 9.9938 



4<i .3 : 

 .70 



Refraction, 

 Parallax, 



O's semi-diameter. 

 Semi-tliameter + Parallax — Refraction 



8.0 = 0.00.33 



2.2009 



23.6 94 



2.2074 

 — 161.2 



-1- 8.4 



152.8 

 — 2 32.8 

 + 16 13.8 



41.85 

 1.62170 

 9.70460 



55.49 

 1.74421 

 9.76460 



71.07 

 1.85169 

 9.76*00 



90.20 

 1.9S318 

 976400 



119.96 

 2.07904 

 970460 



1.35755 

 22.8 



U 35 



+ 



39.S 

 3.6 



-I- 14 35 440 14 35 42.9 



+ 19 35 37.5 35 52.5 



-I- 13 41.0 13 41.0 



-f 39.5 22.8 



25-39.4. 

 3*20.8 ■ 



1.09*6: 

 12.( 



14 35 S'3 

 '+ 26 



14 33 413 



36 17.5 



13 110 



111 



mm: 



31 07S ■ 



0.81187 

 6.5 



14 35 39.3 

 -I- 1.9 



1* 35 11.2 



36 20.0 



13 41.0 



6.5 



25 18.7 

 34 11.3 



0.40008 8.96872 



2.5 0.1 



0.02705 O.60715 



1.1 4.7 



0.98235 1.20187 



9.6 15.9 



14 35 39.3 

 -f 1.2 



11 35 39.3 

 + 0.2 



14 35 393 

 — 0.8 



U 35 393 

 — 1.6 



11 35 393 



— 2.4 



14 35 39:3 

 — 3.0 



1.38630 

 243 



14 35 39.3 

 — 3.8 



.50881 

 32.3 



14 35 39.3 

 — 43 



1.61629 1.7*778 



41.3 55.9 



14 35 393 

 — 49 



14 35 393 

 — 5.7 



1.8*364 

 698 



11 35 39.3 

 — 6.1 



165.57 

 2.21898 

 9.7010O 



1.98338 

 96.3 



11 35 39.3 



— 7.1 



20492 



2.31158 



976160 



2.07618 

 119.a 



14 85 39.3 



— as 



10th of February, mean ai' 17 Lntitudcs, ;55 Hi 18.6 



9di of February, - 17 Latitudes, 55 31 14.3 



55 31 16.4 Lat. of Makci-stown. 



n beconuM — D when the Siii 



