"Sketch I Showing the progress of the Survey in Section No. 9 1848 to 51", U.S. Coast Survey
Period: 1852 (published)
Color: Black & White
12.3 x 7.3 inches
31.2 x 18.5 cm
Small but extremely important chart that shows the original triangulations that were the basis for all later surveying in Texas. The triangulation lines were laid down between 1848 to 1851. The accurate surveys and charts of the Coast Survey not only ensured the safety and reliability of maritime traffic, but also pioneered the modern techniques and equipment utilized by later surveys in the interior.
References: Martin & Martin p. 147.
Good impression with original margins. Toned along fold and one other thin line of toning.