188 



ASTRONOMY. 



9. Azimuths for laying of the prime vertical^ dc. — Continued. 



Observations for the ddermination of the true meridian at San 5er?iar^uio— Continued. 



APRIL 30, Igoo. 





10 



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W4 









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c 



£ 



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(N 



Reading of azimuth circle, telescope directed 



on star. 



Ver. 1 



21 35 38.5 358 47 55 



21 49 08.6 358 47 45 



22 09 35.8 -358 47 45 



• / // 

 88 48 00 



88 47 40 



88 47 55 





3 



• / // 



178 47 45 



178 47 40 



268 47 40 



178 47 45 268 47 30 



268 47 35 



Reading of azimuth circle, telescope directed 



Yer. 1 



■ / // 



359 59 45 

 359 59 45 

 359 59 42 



on signal. 



2 



3 



o / // 



• / '/ 



89 59 50 



179 59 40 



89 59 50 



179 59 35 



89 59 40 



179 59 25 



i 



269 59 20 



269 59 25 

 269 59 20 



1 " • 



K ^j ^ 



<u tS S 



Sii " o 



S as 

 ^ .s b 



c 



/ 



/; 





Urn O V 



S 

 'S 



U CD 



cd '2 



o 



d 



a 



// 



I 



1 11 48.75 1 42 47.33 



1 11 58.75 1 42 53. 



1 11 48.12 1 1 42 22.04 



1-1 



o 





t; ii W 



30 58.58 

 30 54.60 

 30 33.92 



April 29, signal from true meridian 

 April 28, signal from true meridian 



// 



Error of signal from true meridian 30 49.03 



..-...- 30 25.94 



30 48.37 



Mean error of signal from true meridian E. of N. 30 41.11 



OhservatioTU for the determination of the true meridian 



MAY 10, 1855. 



# 



S Si 



i ^ 



g « 



Timeofo 

 by ch 

 2419, si 



1 



Ver. 1 



L 



21 44 51.8 



170 03 15 



Reading of azimuth circle, telescope directed 



on star. 



31 55 32.9 170 03 15 



10 37.8 



170 03 15 



2 



/ tt 



3 



tt 



260 03 20 350 03 ^.5 

 260 03 10 350 03 15 

 260 03 10 350 03 17 



4 





80 03 30 

 80 03 20 

 80 03 25 



Reading of azimuth circle, telescope directed 



on signal. 



Ver. 1 





• / // 



179 59 45 

 179 59 45 

 179 59 45 





2 



• r n 



269 59 45 



269 59 30 

 269 59 35 



3 



359 59 50 



i 



359 59 50 

 359 59 50 



4 



• / // 



89 59 55 



o 



V 



S w ^ 



£J cs s 







O I // 



9 56 26.87 



89 59 50 9 56 28.70 



89 59 55 9 56 29,50 



; If 



1 42 52.09 





o 



(d 



■c « 



o 



if 



8 13 34.78 



I 42 54.67 8 13 34.03 



1 42 35.48 



8 13 54.50 



Error of signal on Uue meridian West of North, 8* 13^ 41".10. 



Obzervaiiom at the intersection of the j>araUel 31^ 20' and the lllth^ of longitude west from Greenwich for the detet minaiion of the true meridian, 



JUNE 14, 1855. 



c 



> 



1- 



5 « 



o .c 









Reading of azimuth circle, telescope Reading of azimuth circle, telescope 



directed on star. I directed on signal. 



21 43 12.5 



Ver. 1 



• I It 



120 18 45 



21 51 34.5 120 19 30 



18 45 

 19 30 



3 



• i M 



240 19 10 

 240 19 15 



Ver. 1 



2 



1 

 1 



• / // 



117 59 00 

 m 59 15 



• 1 II 



257 59 15 

 257 59 15 



3 



237 58 45 

 237 59 30 



£ « o 



G d TMJ 



V h o 



s 



^ 9 II 



2 19 50 

 2 20 05 



0U ^ 



o 





s 



3 



< 



EC -o 



:§ 



§ 



4> 





• / // 



1 42 52.4 

 1 43 01.7 



A = 



S 



S o 



fe g « 



£ S S 



fcC 



• t tt 



36 57 46 



37 03 26 



Remarks 



Chronometer 2419 fast 2A. 

 ^m. 20s. 



■ - - " 



AjLimuth oi fiigoal by a mean of two observations on Polaris East of Nonh^ 37^ 00'^36. 



