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The Jefferson Stone
Lighthouse of the Sky
The Monument of Errors
4 other sections not shown
American Philosophical Society Andrew Ellicott Avenue Babcock Bedini bench mark Buildings and Grounds Capitol building Capitol Stone city of Washington Commissioners Corps of Engineers Courtesy December Depot District of Columbia Ellipse equal altitude instrument erected Ernst established Federal Territory feet Figure foundation Geodetic Survey Greenwich History inches inscription installed intersection Jefferson Pier Jefferson Pier Monument Jefferson Stone John Stewart Kingman Lambert Library of Congress longitude Mendenhall Meridian Hill meridian line meridian markers Meridian Stone National Archives national capital national prime meridian Navy Nicholas King northwest obelisk observations October Office of Public Papers of Thomas Park position Potomac River President President's House prime meridian Public Buildings Smithsonian Institution square Street surveyor Thomas Jefferson Thomas Lincoln Casey Tiber Creek tion transit and equal transit instrument U.S. Military Academy U.S. Naval Observatory United USCE Voigt Washington Monument Washington National Monument