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Old 7th Feb 2009, 07:12
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Loose rivets
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Join Date: Jun 2001
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Pendulums and things that stop them

There is a discussion running on another forum which involves pendulums. A clock pendulum to be precise.

On this one, there is a pulse applied when the swing gets too 'weak'.

The "Hipp Toggle" was used for over one-hundred years, and is rather clever, since it only allows top-up pulse if the swing is getting below range.

What I need to know is what effects cause the pendulum to slow down. I've guessed at mechanical friction and aerodynamic loads, even gravitational anomalies and perturbations. But all a bit vague...can anyone give a clearer reason for the loss of swing?
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