co-op meaning The Rittenhouse Orrery Clock: Restoring a Piece of History

In 1773, David Rittenhouse designed and constructed the orrery clock that is now considered his masterwork. An interactive display in the Anthony J. Drexel Picture Gallery gives visitors the chance to hear the clock's complex chiming.

co-op meaning The Rittenhouse Orrery Clock: Restoring a Piece of History
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