Grandfather Clock
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Gallery Image This fully-operational K'nex Grandfather Clock uses a purely mechanical movement to accurately measure time. The clock is over seven feet tall and uses a small weight and a pendulum. When the clock needs rewinding, K'nex balls are released into an alarm device. No non-K'nex parts are used in this design.

Here's a movie (2.8-MB MPEG) of the clock in action.

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