LONGITUDE. 



225 



TABLE I. 



Tabulation of results for longitude of astronomical station near mouth of Rio Grande^ derived from 

 ohservations made ivith 4Q-i7ich transit^ {by TrougJifon d^ SimmSy) and ivitli sidereal chronometer 

 No. 2440, {by Parkinson dt Frodsham:) By G. C. Gardner and J. if. Clark, under the direc- 

 tion of Major W, H, Emory ^ Chief Astronomer and Surveyor of United States and Mexican 

 boundary survey. (O. N, Thorn ^ computer.) 



•n 



1853. 

 Aug. 13 



17 



18 

 19 

 21 

 23 

 24 

 Sept. 13 



16 

 17 



Oct. 



18 



12 



t 



Longitude west of Greenwich, de- 

 duced from corresponding obser- 

 vations made at — 





v 



,2 



QD 



Xi 



s 



o 





4^ 



m 



ateo 



G 



O 

 O 



Q 



S 





Greenwich [ Radcliffo 

 Observatory. Observatory. 



1st 



2d..., 



■ ( ■ 



k, m. s, 

 6 28 40.00 



6 28 29.28 



6 28 20.69 



Phila. High 

 School Ob- 

 servatory. 



h. in. a, 

 6 28 00.00 



h, m. s. 



1st 



2d, 



1st 



6 28 33.54 

 6 28 32.10 

 6 28 30.48 

 6 28 30.72 

 6 28 24.60 

 6 28 29.69 

 6 28 38.86 



6 28 33.62 

 6 28 35.90 



6 28 30.60 

 6 28 23.86 



6 28 36.03 



6 28 24.96 



2 •* 



^- as 

 O b 



If 



b£ 



40.00 



29.28 



20.69 



67.24 



71.80 



33.54 



32.10^ 

 91.68* 



78.44 



24.60 



101.75 



38.86 



49.92 



g 



> 



ha 



V 



n 

 O 



O 



P 



1853. 

 Oct. 13 



17 

 18 

 19 



20 



Nov. 8 





10 



11 

 13 



18 

 21 



> 



Qi 

 00 



O 





1st 



2d 



1st 





Longitude west of Greenwich, de- 

 duced from corresponding obser- 

 vations made at— 



Greenwich 

 Observatory. 



RadclifTe 

 Observatory. 



A. m. 8. 



A. 771. S, 



Phila. High 

 School Ob- 

 servatory. 



6 28 20.69 



6 28 42.03 



h m. I. 



6 28 28.00 



6 28 34.37 

 6 28 24.09 

 6 28 27.56 



6 28 32.15 

 6 28 26.23 

 6 28 23.32 

 6 28 35,93 



14 Ist & 2d. 6 28 33. GO 



6 28 34.53 

 6 28 30.50 

 6 28 31.07 



2d 



6 26 28.67 

 6 28 29.45 



6 28 30.44 



o 



ctf 



II 



V ^ *^ 



^ O H 



< 



56.00 

 68.74 

 68.87 

 55.12 

 42.03 

 34.53 

 62.65 

 57.30 



23.32 

 35.93 



'64.04 

 28.67 



29.45 



Sum of "Adopted values of the observations for each night," 1306.55 



Number of observations giving to each its value* 



30.38 



Longitude of astronomical station near mouth of Rio Grande, west of Greenwich Observatory ^. 6A. 28m. 30s . 38 



Note Radcliffe Observatory is 5m." 02*. 60 west of Greenwich, (Rad. Observations, vol. XIV, page IX ;) High School Observatory, Philadelphia, 



is 5A. 00m. 37s. 56 west of Greenwich Observatory. In reducing the results from the Kadclifle and High School observations to Greenwich Observa- 

 tory, the above differences of longitudes have been applied. 



• In the column, ^'Adopted values of the observations for each night," the results have been obtained by giving double weight to the High School 

 observations, on account of its relative distance from the mouth of Rio Grande, and equal weight to RadcUffe and Greenwich observations. 



Vol. I 



29 



