Spring-driven pendulum clock by Johannes van Ceulen of The Hague, c. 1695
An early example of a pendulum clock made by Johannes van Ceulen of The Hague, Netherlands. Van Ceulen made clocks for Christiaan Huygens (1629-1695) and this clock follows Huygens' design. The pendulum is suspended between curved 'cheeks', so that its time of swing should be independent of the arc of the swing, but these are too sharply curved to give correct compensation. A single main-spring drives both the going and the striking.
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