72 



GEOGEAPHICAL POSITIONS. 



THE UNITED STATES. 



LAT. M. 



LONG. W. 



VAR. 

 EAST, 

 1895. 



AtJTHORITIBS* 



Mobile, Episcopal Spire... 

 Horn Island, Lighthouse.., 



Mississippi & Louisiana. 



Ship Island, Lighthouse on 



West point 



Chandeleur Island, Light 



house on North point .. 

 Entrance of the Mississippi, 

 Pass a L'Outre Lt.-ho 



South Pass, pier entrance 



S.W. Pass Lighthouse... 

 New Orleans, City Hall [10] 

 Grand Pass, Lighthouse ... 

 TimbaUier Bay, Lt.-ho. on 



West side of entrance , 

 Ship Shoal, Lighthouse . 

 Atchafalaya Bay, Point au 



Fer, Tower 



Vermilion Bay, S.W. Pass 

 Sabine Eiver, Lighthouse 



on Brant Point 



Tkxas. 



Galveston Bay, Lighthouse 

 on Bolivar Point 



Galveston, Court House... 



Matagorda Island, Light- 

 house on East point.... 



Aransas Pass, Lighthouse 

 on North side 



Brazos Santiago, Isabel Pt. 



The Triangulation made 

 for the United States Coast 

 Survey, under the superin- 

 tendence of Professor A. D. 

 Bache, &c. 



NOTES. 



GENERAL NOTE.— In the year 1807, the United States Legislature determined upon 

 the survey of the coast. This was not properly commenced until 1817, when some base 

 lines were measured, and triangles taken. In 1832 the operations were resumed, under 

 .its original superintendent, Mr. F. R. Hassler. 



In 1842 a plan was drawn up by Congress for its further organization, by which it was 

 >continued under the able superintendence of Professor A. D. Bache. In the conducting 

 of this extensive survey, every refinement and appliance to ensure accxiracy has been 

 employed, and many new and important discoveries in geodetic science have been made. 



As shown in the Note on pp. 66-67, the coasts of the United States were divided into 

 eleven sections, of which two are composed of the Pacific Coasts, and the geographic 

 connexion between America and the rest of the world, is mainly dependent on the 

 position of the Observatory of Cambridge near Boston. 



