186 



ASTRONOMY. 









TABLE X— Continued. 









ri 



21st pair. 



22d pair. 



Latitude by 



a mean or each 



night. 



1st result. 



2d result. 



3d result. 



Final result. 



Date. 



! 



G. C. 



653 IV. 



661 S. 



G. C. 



652 N. 



661 S, 



Latitude by 



a mean of each 



pair. 



Latitude by 

 a mean of all the 

 ; observations. 



r.atitude by a 



mean of the results 



for each night. 



Mean of 



1st; 2d, and 31 



results. 



1S54. 



50.71 



J 



II 



31 46 51.22 

 31 46 51.39 

 31 46 50.86 



31 46 51.93 

 31 46 50.78 

 31 46 50.99 , 

 31 46 51.12 

 31 46 51.39 

 31 46 52.29 

 31 46 51.06 

 31 46 51.13 

 31 A(^ 52.17 



1 

 1 



1 



31 46 51 .23 



t If 



^ 



1 

 1 



31 46 51 . 30 



» f n 



1 



\ 

 1 



1 



31 46 51.35 



• ; ; 



28 







29 



1 





- 



1855. 



1 

 1 







2 





50.01 



1 





3 



49.50 



V 



6 



51.85 





9 



1 





11..... 





1 





13 









14- 



1 * ' . 







15 





1 













Mean of each pair. . . 



50.10 



1 



50.93 



31 46 50.29 



9. — Azimutlis for laying off the prime vertical of stations from 1 to 8^ inclusive 



Measurements for establishing tlie prime vertical at the initial point of parallel 31*^ 47'. 



JANUARY 1, 1855. 



Reading of azimuth circle instrument in true meridian. 



mined by transit observations. 



, previously deter- 



Reading of azimuth circle instrument in prime vertical. 



Ver. A. 



i 



c. 



D. 



A. 



B. 



C. 



D. 



1 

 90 00 00 



• / // 



, 180 00 05 



]80 00 00 

 180 00 00 



270 00 07 



269 59 55 



270 00 05 



* / If 



o 1 II 



180 00 00 

 180 00 05 



270 00 15 

 270 00 15 



• t f! 



359 59 55 



360 00 10 



• / // 



89 59 40 



89 59 55 

 89 59 55 



359 59 45 t 



360 00 05 



90 00 00 



^^ V *-■'-' ^^4^ 



1 



i • 





1 



89 59 56.6 



180 00 01.6 



270 00 02.3 



359 59 55 



180 00 02.5 



270 00 15 



360 00 02.5 



89 59 50 



o 



I 



a 



o 



B 



'f 



o 



OS 







4. m. s. 



11-^18 



Observations for the determination of the true meridian at San Luis Springs, 



APRIL 20, 1855. 



Reading of azimuth circle, telescope di- 

 rected on star. 





Yer. 1. 



/ // 



181 29 15 



115414.7 181 28 30 



12 05 00.9 



2. 



3. 



<* / fl 



271 29 10 

 271 26 25 



1 29 15 

 1 26 15 



4. 



91 29 15 

 91 26 25 



181 24 10 271 24 10 



1 24 00 ; 91 24 05 



Reading of azimuth circle when plnne of instrument 



stands in true meridian. 



Yer. 1 



2. 



o I fl 



179 58 23.9 

 179 58 14,7 



3. 



4 



269 58 10.4 

 269 58 09.7 



179 58 28.9 269 58 28.9 



179 53 ^.5 



9 f It 

 359 58 19.4 



359 58 00 



359 58 19 



o f II 



69 58 20.9 

 89 58 09.9 

 89 58 24 



269 58 19.3 



359 58 12.8 I 89 58 18.2 



o .a 



I 



O 



g 





■C 







> 



CJ 





s 



P^^ 



rt 





a 



CQ 



c 



4 



'Q 



*c 



m 



o 





i3 



CJ 





3 



P. 



o 



Si 



^ 



Ph 



M 



^^b 



> 



E 



o 



o 



o 



CQ 



O 









/ rr 



1 30 54.1 



1 28 15.3 

 1 25 41.10 



Remarks. 



Chronometer 2419 is fast 

 2A. 42m. 0.57s. 



The reading of azimuth 

 circle when telescope 

 was directed on sig- 

 nal = zero. 



Error of signaUrom true 



meridian went of north 

 = 1' 41'^8. 



Ver. No. 1 



1 37.5 



Q 1 40.7 



1 47.9 



4..,.-... .,. 1 41.8 



Mean , , ,,, 1 41.8 



