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Andrew Ellicott. Courtesy of the Library of Congress (LC-USZ62-98345).


Ellicott, Andrew (24 January 1754–20 August 1820), mathematician, astronomer, and surveyor, was born in Buckingham, Bucks County, Pennsylvania, the son of Joseph Ellicott, a millwright and clockmaker, and Judith Bleaker. The family belonged to the Society of Friends. After attending a Quaker elementary school in Solesbury, Ellicott was enrolled at the age of fifteen in ...


Leeds, John (18 May 1705– March 1790), public official, surveyor, and mathematician, was born at Bay Hundred, Talbot County, Maryland, the son of Edward Leeds and Ruth Ball. Leeds, apparently self-educated, developed an expertise in mathematics and an interest in astronomy. He married Rachel Harrison in a Quaker ceremony in 1726; the couple had three daughters. He resided in Talbot County for his entire life and held a variety of public offices, beginning in 1734 as a justice of the peace....