William Rittenhouse, grandfather of the astronomer David Rittenhouse, built the first paper mill in America along Paper Mill Run in the late 17th century.
There is a persistent rumor that David Rittenhouse, the famous astronomer and instrument-maker of Pennsylvania, surveyed the circle around New Castle, but this is likely not correct.
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The building is named for David Rittenhouse, a notable American astronomer and Penn professor of the 18th century and the president of the American Philosophical Society (he succeeded Franklin in this position).