Interchangability of discs for early 400 day clock

Discussion in '400-Day & Atmos' started by Weight Driven, Jun 13, 2007.

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  1. Weight Driven

    Weight Driven Registered User
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    May 24, 2004
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    I have an early unmarked 400 day clock that is missing it's disc pendulum. I looked it up in the Horolovar guide and it does take a disc. My question is could I use just about any disc and with some experimentation with different sizes of suspension springs expect this clock to keep decent time? Thanks for any advice on this.
     
  2. John Hubby

    John Hubby Senior Administrator Emeritus
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    Sep 7, 2000
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    In theory you can put just about any disc pendulum on an early 400-Day and it can be made to work. However, depending on who made the clock there are some "correct" pendulums, since most makers stuck to one or two designs for their clocks. If you will post photos and also the plate number from the Repair Guide it should be possible to identify who made it and then to pick a couple of pendulums that would be contemporary with the clock.

    John Hubby
    >>>>
     
  3. Weight Driven

    Weight Driven Registered User
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    Thanks John. I will try and post a pic within the next few day. Again, thanks.
     
  4. Weight Driven

    Weight Driven Registered User
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    Here are some photos of the movment in question, hope they come out.
     

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  5. kirxklox

    kirxklox Registered User
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    Gebr. Junghans - very scarse clock.

    Disc Pendulum with Balls on Scales.
     
  6. Weight Driven

    Weight Driven Registered User
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    thanks Sam. Looks like I won't be able to find an original pendulum.
     
  7. John Hubby

    John Hubby Senior Administrator Emeritus
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    WD, I'm attaching a photo below of the pendulum that normally goes with your clock. As others have already pointed out these are quite scarce. Junghans "did" use at least one other design for their clocks, but it's even more rare than this one and I don't have a photo of it.

    I would suggest you find a disc pendulum with gallery, of about any description and put it with your clock. Maybe some day the correct one will show up.

    Also, for my research info, could you post the serial number of the movement? I can't quite make it out from your photo.

    John Hubby
    >>>>
     

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  8. Weight Driven

    Weight Driven Registered User
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    HI John. For your records, the serial number is 27068. Thanks again everyone for your help.
     
  9. Michael Davies

    Michael Davies Registered User

    Nov 29, 2005
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    I wonder if my Plate 1625 Junghans (1910?) has one of the "rare" pendulums John is referring to - pictures below; this one is not in the Terwilliger Guide. Serial number is 32843. The beat is set, as John says, by rotating the anchor pin collet around its pinion, and it is regulated by turning the upper pendulum disc which raises or lowers the pendulum balls on the central shaft.

    Michael Davies.
     

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  10. kepiting1sg

    kepiting1sg Registered User

    Jun 19, 2006
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    Hello Michael,

    You sure did a fast job cleaning up your clock :clap:

    Mine just come in through the post yesterday.
    Serial number: 31971

    10.jpg


    11.jpg

    12.jpg
     
  11. Michael Davies

    Michael Davies Registered User

    Nov 29, 2005
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    Hi KP - I knew you had the other one! I got mine a few days earlier, and being retired from full-time work has the wonderful advantage of allowing time to be my own to use as I wish!

    The wooden base insert in mine was so woodworm-riven it practically crumbled as I removed it, but all else was fine. The Book says a .004 suspension wire is right, but I found it wasn't and I needed to use a .0045 only very slightly thinned.

    I will be very interested to hear John H's views on both the pendulums and the clock manufacturing dates in due course.
     
  12. kepiting1sg

    kepiting1sg Registered User

    Jun 19, 2006
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    Hi Michael,

    How I wish I can retired like you and have more time to work on my clocks.:thumb:

    I guess both of us were chasing these 2 clocks over eBay because of the interesting pendulum on them. ;)
     

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