U.S. Coast Survey A.D. Bache Superintendent, Sketch A Showing the Primary Triangulation in Section I and the Connection of The Baselines in Sections I and II From 1844 to 1864 Elevation Views The board’s corners and edges

The board’s corners and edges rubbed and bumped

astronomical

Some towns and cities shown in detail are Boston

Delaware Bay

These are reproductions produced in a limited quantity for the 1939 printing of the book

U.S. Coast Survey A.D. Bache Superintendent, Sketch A Showing the Primary Triangulation in Section I and the Connection of The Baselines in Sections I and II From 1844 to 1864 Elevation Views The board’s corners and edgesA nice chart of the Northeast Coast of The United States showing the triangulation of the Survey. This is an overview chart of the area showing fine coastline detail and the states and the various triangulation stations. IMPORTANT NOTE: All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi permeable membrane,