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Sehner-Ellicott-Von Hess House is a historic home located at 123 N. Prince Street, Lancaster, Pennsylvania. It was built about 1780 by George Sehner, and is a finely restored house built in the Georgian style of architecture. It was occupied by Andrew Ellicott (1754–1820), first United States Surveyor General, from 1801 to 1813. [2]
Andrew Ellicott (January 24, 1754 – August 28, 1820) was an American land surveyor who helped map many of the territories west of the Appalachians, surveyed the boundaries of the District of Columbia, continued and completed Pierre (Peter) Charles L'Enfant's work on the plan for Washington, D.C., and served as a teacher in survey methods for Meriwether Lewis.
Benjamin Banneker (1731-1806) was a free African American mathematician and astronomer who assisted Andrew Ellicott during the first three months of the 1792 — 1793 survey of the District of Columbia's original boundaries. [7] The stone is one of 40 markers that once lined the District's boundaries.
The National Capital Parks was a unit of the National Park System of the United States, now divided into multiple administrative units. It encompasses a variety of federally owned properties in and around the District of Columbia including memorials, monuments, parks, interiors of traffic circles and squares, triangles formed by irregular intersections, and other open spaces.
Map of the boundary stones. The District of Columbia (initially, the Territory of Columbia) was originally specified to be a square 100 square miles (260 km 2) in area, with the axes between the corners of the square running north-south and east-west, The square had its southern corner at the southern tip of Jones Point in Alexandria, Virginia, at the confluence of the Potomac River and ...
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Among the most dramatic changes to the map, Rhode Island Avenue no longer crossed through Square No. 15 at the perfect angle that it had in the L'Enfant plan, and as such was eliminated from Washington, DC. [9] [10] Detail of Ellicott's 1792 plan for Washington with the space where Square No. 15 would be, outlined in red