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John's gravity escapement

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Uploaded by on Feb 8, 2009

John's Gravity Escapement
This shows a working gravity escapement which is well known for use in tower clocks such as "Big Ben" in London. It was designed by Lord Grimthorpe in 1851

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Science & Technology

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Uploader Comments (john92037)

  • It really needs a fly! You could bifurcate the pendulum rod and extend the arbor backwards to carry a suitable fly.

  • There is a fly. The pendulum is set about an inch behind he back-plate and the crutch has a double right-angle bend so that a fly can be accommodated. This is 1/32 aluminum sheet about 4 inches long and 3/8 wide. It works just fine.

  • Correct! The title should be gravity, not grasshopper.

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  • Okay.. it needs a bigger fly. Or less power to the drive train. I'm afraid it just looks too violent in its action to me.

  • Hi

    very nice to see another Gravity escapement clock.These are not very common.I have a Longcase reg. Gravity clock with the Thwaites version (only having one impusle side) and is 6 legged with no fly, seems that these were intened for the Regulater style longcases but I can't see the reason for this.

    Well done mark.

  • your title is wrong :-) No grasshopping here.

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