Bonsall, Joseph Hartshorne (sold)
Joseph Hartshorne Bonsall (September 7, 1833 - April 9, 1876) was an American civil engineer and surveyor active in Philadelphia, Pennsylvania and later Denver, Colorado. Bonsall was born in Philadelphia, the son of Edward H. Bonsall (1794 - 1879), a well-respected citizen of that city and founder of the 'Philadelphia, Germantown and Norristown Railroad'. He worked the Philadelphia Survey Department, where along with Samuel Lightfoot Smedley (1832 - 1894), he prepared a large-scale map of Philadelphia. He relocated to Denver Colorado around 1869 where he worked as a surveyor with the Pacific Railroad. There, working with Edwin Hosmer Kellogg (1845 - 1927) he published several important maps of Colorado and Denver. Bonsall died of smallpox in 1876.
The most detailed general map of Colorado's central mining regions published in the 1870s.
Map of Colorado with Plans of its Principal Towns.
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A dramatic large-scale 1872 Joseph Hartshorne Bonsall and Edwin Hosmer Kellogg folding wall map of Colorado, issued during the heady days between the Colorado Gold Rush (1859) and the Colorado Silver Boom (1878). This piece is highly significant both for its extreme rarity and for the fact it offers unprecedented detail. Surpassing the Gilpen-Ebert series, the map illustrates maintained trails, and identifies ranches, springs, military reservations, post offices, and more. We are aware of no earlier map, nor any other map issued in the subsequent 10 years, that offers greater detail. (more details)