Notable Contributions To The United States
David Rittenhouse made many breakthroughs during his life, which were great contributions to the U.S. During the first part of his career he was a surveyor for Great Britain, and later served in the Pennsylvania government. His 1763–1764 survey of the Delaware-Pennsylvania border was a 12-mile circle about the Court House in New Castle, Delaware, to define the northern border of Delaware. Rittenhouse's work was so precise and well-documented that it was incorporated without modification into Charles Mason and Jeremiah Dixon's survey of the Pennsylvania-Maryland border.
Later Rittenhouse helped establish the boundaries of several other states and commonwealths both before and after the Independence, including the boundaries between New Jersey, New York and Pennsylvania. In 1763 Mason and Dixon began a survey of the Pennsylvania-Maryland border, but this work was interrupted in 1767. In 1784 Rittenhouse and Andrew Ellicott completed this survey of the Mason-Dixon line to the southwest corner of Pennsylvania. When Rittenhouse's work as a surveyor ended, he resumed his scientific interests.
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