Interesting Clock
Lots of things to see at the V&A museum. Here's the strangest time keeping device I've ever seen. A metal ball rolls along the zig zag groove, side to side as it makes its way down. It gets to one end, hits a lever and the plate tilts the other way and the ball rolls back. An endless cycle. Each one exactly 30 seconds. The device is remarkably clever, but I question how precise it is, especially if the ball were to fall off.
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