This collection consists of original correspondence to and from Chauncey Barnard, Jr., civil engineer, of Hartford, Connecticut. It is comprised of sixty-two original letters and documents from the 1830s to 1860 (most of the letters date from the 1830s), revealing much about the practical challenges early 19th century civil engineers faced. Most of the correspondence describes railroad and canal surveying, including discussions of jobs, finances, lawsuits and supplies. A majority of the letters relates to the early Mauch Chunk Switch Back Railway for which Barnard served as engineer. Other railroads described in this correspondence include: the Lehigh Coal and Navigation Co. (with which the Mauch Chunk connected), the Erie Railroad, the Savannah & Macon Railroad, and the Beaver Meadow Railroad & Coal Co. Correspondents include: E. A. Douglas, Edwin F. Johnson, William Parker, and Louis Waldo.