Restoration of Big Ben

[interest]

Watching a SBS program on the restoration of Big Ben, one of the most photographed buildings in the world.

On the pendulum, to keep it balanced & swinging in perfect timing amongst other weights is a small stack of ten, of the humble British Penny.

Too remove a single penny, will cause the clock to gain two-fifths of a second in 24 hours
Place an extra penny on the stack, will cause the clock to then lose two-fifths of a second in 24 hours
Here is the stack.
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[Triggersmob]

I remember seeing that on a TV program many years ago.

[Mister T]

Oh nice - I vaguely remember reading something about this but thought it was just a tall tale.