Cuckoo clock Oddity?

[Skywave]

I always thought that pendulums got longer and the clocks slowed down as my French one did.
Mike

You're confusing cause and effect. A pendulum-timed clock will slow down as a consequence of the pendulum increasing its length, not the 'other way round'.

Al.

Indoors in the UK, wood tends to shrink in the winter and expand in the summer.
Lawrence.

Time for one period of pendulum is proportional to the square root of the pendulum's length (for small angular displacements only). So, if the length of the pendulum has shortened due to shrinkage, the pendulum will complete one cycle of oscillation in less time - so the clock will run faster

Al.