Benjamin Banneker: SW-9 Intermediate Boundary Stone
Encyclopedia
Benjamin Banneker: SW 9 Intermediate Boundary Stone, also known as Intermediate Stone of the District of Columbia, is a surveyors' boundary marker stone. It is a one foot square sandstone block, extending about 18 inches above ground and probably about 2 feet below ground.
It is one of 40 original boundary stones of the District of Columbia
.
It was named and was declared a National Historic Landmark
in 1976 at the instigation of the Afro-American Bicentennial Corporation.
Perhaps only by its naming in 1976, it is associated with the life of Benjamin Banneker
, (1731-1806), an African American
surveyor, mathematician and astronomer who assisted Andrew Ellicott
during the first two month's of Ellicott's 1791-1792 survey of the boundaries of the original District of Columbia.
It is one of 40 original boundary stones of the District of Columbia
Boundary Stones (District of Columbia)
The Boundary Markers of the Original District of Columbia are the 40 milestones that mark the four lines forming the boundaries between the states of Maryland and Virginia and the square of 100 square miles of federal territory that became the District of Columbia in 1801...
.
It was named and was declared a National Historic Landmark
National Historic Landmark
A National Historic Landmark is a building, site, structure, object, or district, that is officially recognized by the United States government for its historical significance...
in 1976 at the instigation of the Afro-American Bicentennial Corporation.
Perhaps only by its naming in 1976, it is associated with the life of Benjamin Banneker
Benjamin Banneker
Benjamin Banneker was a free African American astronomer, mathematician, surveyor, almanac author and farmer.-Family history and early life:It is difficult to verify much of Benjamin Banneker's family history...
, (1731-1806), an African American
African American
African Americans are citizens or residents of the United States who have at least partial ancestry from any of the native populations of Sub-Saharan Africa and are the direct descendants of enslaved Africans within the boundaries of the present United States...
surveyor, mathematician and astronomer who assisted Andrew Ellicott
Andrew Ellicott
Andrew Ellicott was a U.S. surveyor who helped map many of the territories west of the Appalachians, surveyed the boundaries of the District of Columbia, continued and completed Pierre Charles L'Enfant's work on the plan for Washington, D.C., and served as a teacher in survey methods for...
during the first two month's of Ellicott's 1791-1792 survey of the boundaries of the original District of Columbia.