Temperature Compensating Pendulum

Discussion in '400-Day & Atmos' started by instarclock, Mar 2, 2020.

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  1. instarclock

    instarclock Registered User
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    Mar 23, 2009
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    Hello all,

    I wanted to share a couple of pictures of a clock I picked up a while back which features a compensating pendulum. Plate 1439. I haven’t cleaned it up yet, but it works fine and keeps good time.

    Thanks for looking.
    Rt

    AFD93EC5-63F7-4A33-86A5-974A34E094F4.jpeg ABCA5915-FC96-4C00-B9E5-E3EF941AAB56.jpeg
     
  2. etmb61

    etmb61 Registered User
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    Oct 25, 2010
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    Hi Rt,

    The repair guide calls that one a compensating pendulum but really it isn't. It's just a different design. It should have a patent number on the bottom.

    Thanks for sharing.
    Eric
     
  3. KurtinSA

    KurtinSA Registered User
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    Nov 24, 2014
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    I thought the same thing looking at the design. In fact, in the repair guide for the pendulum it lists "Temperature Compensating?". Note the "?" at the end!!

    Kurt
     
  4. instarclock

    instarclock Registered User
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    Mar 23, 2009
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    Thanks for the correction. I was just going by the info I got from the seller. I bought it from John Hubby back in November.

    Thanks for looking.
     
  5. John Hubby

    John Hubby Senior Administrator Emeritus
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    Sep 7, 2000
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    For info, the clock movement is much earlier than the pendulum. That serial number was made in late 1910, and the pendulum wasn't patented until 1924. There may be patent numbers stamped on the bottom of the crossbars of the pendulum, if so it was made between the patent date in 1924 and the same month one day earlier in 1927 with the DRGM expired and JUF evidently chose not to renew it for another three years.
     
    etmb61 likes this.
  6. instarclock

    instarclock Registered User
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    Mar 23, 2009
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    Thanks for the information, John. I printed it out and put it with my clock.
    Rt
     

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