U.S. Coast and Geodetic Survey

Antique Chart of Key West, Florida


Preliminary Chart of Key-West Harbor and Approaches From a Trigonometrical Survey under the direction of A.D. Bache, Superintendent of the Survey of the Coast of the United States.


Very cool hydrographic survey chart of the vicinity of Key West, Florida long before any bridges. This antique chart, based on a trigonometrical survey, was released by the U.S. Coast Survey in 1852. Includes a tide table and very interesting cross-sectional views of elevation of coral heads, (water depth) recorded across several lines on the chart at Sand Key and the reefs at the East Channel. Other noted points include Fleming's Key, Francfort Bank, East Crawfish Key, West Crawfish Key, Mangrove Keys, and Raccoon Key.

A trigonometrical survey of a portion of the earth's surface is conducted by measuring a single base distance, and connecting it with various points in the tract surveyed by a series of triangles, the angles of which are carefully measured. Relative positions and distances of all parts are computed from these data.

With extensive sailing directions for several key approaches to Key West including: the East Channel, the Main Ship Channel ("At Night. Bring the North Stat to range after Key West Light House and stand for it when Sand Key (or Sound Key Light Boast bears S.W. by W. S. 62 degrees W) a vessel drawing over 16 feet of water had better anchor and wait for a pilot".); Rock Key Channel; Sand Key Channel; West Channel; and North West Channel. Second Edition.

CREATOR: U.S. Coast and Geodetic Survey



BODY OF WATER: Gulf of Mexico

CONDITION: Good.  Laid to light tissue with folds not visible. Careful hand coloring.

COLORING: Modern hand coloring.


SIZE: 14 " x 18 "




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