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TABLE H.

Tabulation of results for longitude of astronomical station near mouth of Rio Grande, derived from observations made with 46-inch transit, (by Troughton & Simms,) and with sidereal chronometer No. 2440, (by Parkinson & Frodsham) by G. C. Gardner and J. H. Clark, under the direction of Major W. H. Emory, Chief Astronomer and Surveyor of United States and Mexican boundary survey.

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h. m. S. ..... = 6 28 30.52

h. m. s.
Resulting longitudes from observations on moon's 1st limb... = 6 28 31.42 Mean longitude.....

Do..............do ..............do ....... 2d limb... = 6 28 29.61
Longitude of astronomical station near mouth of Rio Grande, west of Greenwich Observatory...

....... = 6h. 28m. 308.52

NOTE.--Radcliffe Observatory is 5m. 02s.60 west of Greenwich, (Rad. Observations, vol. XIV, page IX.) High School Observatory, Philadelphia, is 5h. 00m. 378.56 west of Greenwich Observatory. In reducing the results from the Radcliffe and High School observations to Greenwich observations, 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 the Rio Grande, and equal weight to Radcliffe and Greenwich observations.

TABLE I.

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

observations made with 46-inch transit, (by Troughton & Simms,) and with sidereal chronometer No. 2440, (by Parkinson & Frodshcm :) By G. C. Gardner and J. H. Clark, under the direction of Major W. H. Emory, Chief Astronomer and Surveyor of United States and Mexican boundary survey. (C. N. Thom, computer.)

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Longitude of astronomical station near mouth of Rio Grande, west of Greenwich Observatory...........

................. 6h. 28m. 308.38

NOTE.-Radcliffe Observatory is 5m. 028.60 west of Greenwich, (Rad. Observations, vol. XIV, page IX ;) High School Observatory, Philadelphia, is 5h. 00m. 375.56 west of Greenwich Observatory. In reducing the results from the Radcliffe and High School observations to Greenwich Observatory, 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, an account of its relative distance from the mouth of Rio Grande, and equal weight to Radcliffe and Greenwich observations.

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TABLE K.

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

observations made with 46-inch transit, (by Troughton & Simms,) and with sidereal chronometer No. 2440, (by Parkinson & Frodsham:) By G. C. Gardner and J. H. Clark, under the direction of Major W. H. Emory, Chief Astronomer and Surveyor of the United States and Mexican boundary survey. (C. N. Thom, computer.)

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Longitude of astronomical station near the mouth of the Rio Grande west of Greenwich Observatory..

h. m. $. som 6 28 30.45

NOTE.-Radcliffe Observatory is 5m. 02.60s. west of Greenwich, (Radcliffe Observations, vol. XIV, page IX.) High School Observatory, Philadelphia, is 5h. 00m. 37.56s. west of Greenwich Observatory. In reducing the results from the Radcliffe and High School observations to Greenwich observations, the above differences of longitudes have been applied.

* Ir 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 the Rio Grande, and equal weight to the Radcliffe and Greenwich observations.

TABLE VIII. Tabulation of results for the latitude of astronomical station at Frontera, Texas, derived from observations made with the zenith telescope No. 4, on twenty-four pairs of stars : By Major W. H. Emory, Chief Astronomer and Surveyor of United States and Mexican boundary survey.

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TABLE VIII-Continued.

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TABLE VIII-Continued.

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Latitude of astronomical station at Frontera, Texas, = 31° 48' 44'1.53.

TABLE IX." Corrections to be applied to the results for latitude of astronomical station at Frontera, Texas, in

order to introduce the elements of the stars as observed at the Washington Observatory, in 1852 and 1853.

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