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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.
On January 1, 1793, Andrew Ellicott submitted to the commissioners a report that stated that the boundary survey had been completed and that all of the boundary marker stones had been set in place. Ellicott's report described the marker stones and contained a map that showed the boundaries and topographical features of the Territory of Columbia.
The first north-south line, Eastern Ohio Meridian, was to be the western boundary of Pennsylvania, sometimes called Ellicott's Line [3] after Andrew Ellicott, who had been in charge of surveying it, and the first east-west line (called the Geographer's Line or Base Line) was to begin where the Pennsylvania boundary touched the north bank of the ...
By coincidence, the Preemption Line is near the meridian of the Capitol at Washington (77° 00' 33" W of Greenwich), but the popular assumption that the Preemption Line was intended to be on that meridian seems to be a myth, since the District of Columbia had not been surveyed at the time of the 1786 treaty; in fact Benjamin Ellicott helped map and survey the District of Columbia in 1791 ...
The treaty stipulated that both countries would participate in a joint expedition to mark the agreed-upon boundary; President George Washington selected Andrew Ellicott as commissioner. The survey was completed in early 1800, although American settlers had already been pouring into the area since the proclamation of the treaty. [2] [6]
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Andrew Ellicott taught Lewis and Clark how to use a sextant to map their position. Lewis and Clark would leave from Wood River, Illinois and document the wilderness all the way to the Pacific Ocean. Lincoln: politics and surveying