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Posted by: Ed Redmond
Originally published in 1874, these maps of the eastern half of the United States were designed to show the distribution of diseases including typhoid, malaria, pneumonia, tuberculosis, and rheumatism that affected the US population. The maps were published by L.H. Carney, M.D., but we find no biographical data on the author. Medical data (in the …
Posted in: 19th century cartography
Posted by: Ed Redmond
As we learned in my previous blog, surveying is the art of measuring land. During the 18th century colonial surveying was relatively crude. A fixed “beginning point” such as a tree or a rock was established as the starting point for the survey. A 66 foot long chain, commonly known as a Gunters Chain, was …
Posted in: 18th century cartography, 19th century cartography
Posted by: Ed Redmond
The following post is adapted from an essay written by Richard W. Stephenson, former Specialist in American Cartographic History at the Library of Congress, in “Land Ownership Maps: A Checklist of Nineteenth Century Unites States County Maps in the Library of Congress.” The essay has been edited and updated by Ed Redmond, a cartographic reference …
Posted in: 19th century cartography, American History