A beautiful example of the U.S. Coast Survey’s 1855 triangulation chart or map of the Florida Peninsula.  This map covers from St. Augustine and Apalachee Bay southwards as far as Key West and the Dry Tortugas.   Triangulation charts of this type were prepared by the Coast Survey before more detailed survey work could take place.  They firmly mapped the coastline noting various pointes, inlets, harbors, and Islands.  Names Fort Lauderdale, St. Augustine, Key West, and Miami.  This particular example features three insets focusing on St. John’s River as far as Jacksonville, the Tortugas Islands, and the Florida coastline in the vicinity of Jacksonville.   Sailing directions are given to the left of Charlotte Harbor.  The upper right quadrant features a table of latitudes and longitudes identifying major points, cities, and lighthouses.  Published in the 1855 Superintendent's  Report  under the supervision of A. D. Bache, one of the most prolific and influential Superintendents of the U.S. Coast Survey.
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<a href="https://en.wikipedia.org/wiki/United_States_Coast_Survey" class="extiw" title="en:United States Coast Survey">United States Coast Survey</a></div>
1855 (dated)
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