Chattanooga, Tennessee (vicinity). Tripod signal erected by Captains Dorr and Donn of U.S.

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Chattanooga, Tennessee (vicinity). Tripod signal erected by Captains Dorr and Donn of U.S. Coast Survey at Pulpit Rock on Lookout Mountain. Date Created/Published: 1864. Photo of the American Civil War provided by LOC. Original medium: 1 negative (2 plates) : glass, stereograph, wet collodion.