Post Your W. Würth & Co. Clocks Here

Discussion in '400-Day & Atmos' started by Chick Curry, Apr 4, 2007.

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  1. Pat L.

    Pat L. Registered User
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    Jul 28, 2003
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    John,
    Here are some pictures of the inside of the pendulum's cast brass shell and the discs that were inside of it. The bottom two discs are steel (one is used as the bottom cover), the next two discs are brass, and the last disc is copper. Note that the inside surface of the cast brass shell is inscribed with the movement serial number. Also, the two brass discs are stamped with the numbers 2055 and 1248.

    A number.40 suspension spring was put in the clock yesterday afternoon and it ran approx. 16 hours, gaining only 5 minutes, before being stopped to inspect the inside of the pendulum this morning. So it seems like it will be easy enough to get it regulated now.

    Thanks again for the information that you and Eric have provided. Pat L.

    Wurth disc shell & discs.JPG Wurth inside disc shell.JPG Wurth SN inside disc.JPG Wurth steel discs.JPG Wurth brass disc 1248.JPG Wurth brass disc 2055.JPG Wurth copper disc.JPG
     
  2. KurtinSA

    KurtinSA Registered User
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    Nov 24, 2014
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    The time gain is essentially 1/3 of a minute per hour, or about 20 seconds per minute. Pretty fast. You will need a thinner spring on the order of 0.0035 or 0.0036 inches. Note that each 0.0001" represents about 4 seconds per minute.

    Kurt
     
  3. etmb61

    etmb61 Registered User
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    Oct 25, 2010
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    Pat,

    Quite often extra discs are added to bring a clock in time with the suspension springs that are available. In it's original form, your pendulum would not have had any extra weight and would have had a smooth cover held in place by a lip just inside its edge.

    https://mb.nawcc.org/attachments/pendulum-1-jpg.273005/

    Eric
     
  4. etmb61

    etmb61 Registered User
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    John,

    This pendulum, 21996, is not consistent with any other Crown pendulum I've seen or recorded. The disc itself is too thick and matches the other gallery style discs in its number range. I would say this is a marriage of two pendulums.

    Eric
     
  5. etmb61

    etmb61 Registered User
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    #355 etmb61, Sep 21, 2019
    Last edited: Sep 21, 2019
    I know this is an old post, but the suspension bracket in question here was used by JUF with their "PA" and "DRP" movements, and when they started numbering their movements again. See this post:
    Seeking info: Urania 400-day clock with disc pendulum

    and this one:
    Jahresuhrenfabrik Angemeldet Clock Info required

    The highest number I've recorded with this bracket is JUF 53182.

    Eric
     

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