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Coast Geodetic Survey
Historical Maps
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Maps
Rough sketch of Newton Signal showing lines of sight to observed triangulationstations.
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.jpg
(3.38 MB)
Title page to computations of triangles observed by Ferdinand Hassler around New York City in 1817.
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.jpg
(11.27 MB)
Rough sketch showing the general appearance of the 30-inch theodolite whenmounted.
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.jpg
(7.95 MB)
Main triangles of the Survey of the Coast of the United States showing method of computing using logarithms.
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.jpg
(3.81 MB)
Computation of triangles working outward from Fire Island baseline showing method of computing using logarithms.
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.jpg
(3.78 MB)
Field observations of angles showing different plate settings of theodolite.
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.jpg
(3.26 MB)
Computation book page showing method of determining final value of observedangle.
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.jpg
(3.47 MB)
Computations showing method of determining links of sides of triangles by usinglogarithms.
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.jpg
(3.44 MB)
Topographic shoreline manuscript showing section of Hudson River includingWashington Irving's home below Tarrytown. Sheet produced by Hugo L. Dickins,registry No.T-132.
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.jpg
(9.37 MB)
Topographic shoreline manuscript showing section of Hudson River in thevicinity of today's Tappan Zee Bridge. Sheet produced by Hugo L. Dickins,registry No.T-132.
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.jpg
(9.41 MB)
Topographic sheet from Fort Lee to Boompers Hook by Thornton A. Jenkins, USN.Registry No. T-96
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.jpg
(6.38 MB)
Topographic sheet between Patchogue and Smith Point, Long Island, by CharlesRenard. Title block of Registry No. T-2.
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.jpg
(16.86 MB)
Topographic sheet between Patchogue and Smith Point, Long Island, by CharlesRenard. Registry No. T-2.
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.jpg
(13.48 MB)
Western portion of Hydrographic Sheet No. H-44. This was actually the firsthydrographic survey sheet completed by the U.S. Coast Survey. Surveyed byLieutenant Thomas R. Gedney, USN.
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.jpg
(7.29 MB)
Center portion of Hydrographic Sheet No. H-44. This was actually the firsthydrographic survey sheet completed by the U.S. Coast Survey. Surveyed byLieutenant Thomas R. Gedney, USN.
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.jpg
(4.75 MB)
Blowup of title block of Hydrographic Sheet No. H-44 showing South Coast ofLong Island, Great South Bay, 1:10,000, 1834, Lt. T. R. Gedney, USN.
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.jpg
(4.14 MB)
Section of Hydrographic Sheet No. H-44. This was actually the firsthydrographic survey sheet completed by the U.S. Coast Survey. Surveyed byhydrographic survey sheet completed by the U.S. Coast Survey. Surveyed by
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.jpg
(5.03 MB)
Title block of Chart of Sandy Hook Bar, sounded by Lieutenant T. R. Gedney. This survey discovered Gedney's Channel into New York Harbor helping insure itsplace as the great mercantile capital of the United States.
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.jpg
(10.83 MB)
Tide diagram of Chart of Sandy Hook Bar, sounded by Lieutenant T. R. Gedney. This is one of the earliest tide records of the Coast Survey. Meteorologicalinformation was also included showing an awareness of the effect of winds ontidal levels.
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.jpg
(6.07 MB)
Blowup of tide diagram of Chart of Sandy Hook Bar by Lieutenant T.R. Gedney.Tide scale for September 1835 with meteorological and astronomical informationincluded.
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.jpg
(4.22 MB)
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