Tripod signal erected by Capts. Dorr and Donn of U.S. Coast Survey at
Pulpit Rock on Lookout Mountain. Battle of Chattanooga.
Are John Donn and Frederick Dorr the two men in this image?
Image ID: cgs01738, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Location: Tennessee, Chattanooga area Photo Date: 1863?-1864? Credit: Library of Congress American Memory Collection
