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Why do clocks tick-toc?

Why do clocks tick-toc?-example-1

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4 votes
the gears and mechanism's sudden movements make the noises
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User Butallmj
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In those, the pendulum has a mechanism which allows the hands to move forward by one gear every time it swings back and forth (google "escapement gear" if you want to know what this looks like). Hence, the 'tick' sound is when the pendulum swings one way and the 'tock' is when it swings back.
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User Jenina
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