New Addition - ITR Weight Driven Motor Wound Master Clock

Discussion in 'Electric Horology' started by Joe B, Aug 9, 2019.

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  1. Joe B

    Joe B Registered User

    May 2, 2018
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    Just bought this guy! Should be able to have some more detailed photos and info on it in the next week or so... Could not find the model number or any ID plate. Does anyone recognize the model? Or have an estimate on the age?

    Runs great but needs service and lots of small TLC.

    It was from the estate of a higher level employee at ITR during the IBM conversion when they retired this clock to him.

    This is the only photo I have for now:
    Clock.jpg
     
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  2. Burkhard Rasch

    Burkhard Rasch Registered User
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    Jun 1, 2007
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    wow,that looks to be a great clock,congrats! Looking foreward to more pics and technical details!
    Burkhard
     
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  3. Joe B

    Joe B Registered User

    May 2, 2018
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    Alright, so here it is - Cleaned up, serviced, and running! The only thing is that it currently seems to rewind every 12 hours or so, does anyone know if that seems right? I thought these rewound more like every 2-3 days but I could be wrong. The mercurial pendulum is perfectly in tact just removed in the photos for cleaning of the mercury and glass vials before reinstalling. Also - I have the original hands but they were not installed for the photo.

    IMG_8311.JPG IMG_8310.JPG IMG_8309.JPG IMG_8308.JPG IMG_8307.JPG IMG_8306.JPG IMG_8305.JPG IMG_8307.JPG IMG_8306.JPG IMG_8305.JPG IMG_8304.JPG IMG_8303.JPG IMG_8302.JPG IMG_8301.JPG IMG_8300.JPG IMG_8299.JPG IMG_8296.JPG IMG_8294.JPG
     
  4. Scot Traffis

    Scot Traffis Registered User
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    Apr 8, 2011
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    the winding is about right, both of mind wind about every 11 or 12 hours
     
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  5. Scot Traffis

    Scot Traffis Registered User
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    Apr 8, 2011
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    your clock has a case just like Self Winding Clock Co. master clock. Nice clock, I like the motor rewind clocks they are very accurate timekeepers and run forever with very little upkeep
     
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  6. Joe B

    Joe B Registered User

    May 2, 2018
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    Thanks Scot, I hope to have it running completely by next week. As I was placing the mercury jars back in the pendulum I thankfully notices a crack in the suspension spring... so now I'm waiting for the new one to be delivered. Better that i found it that way though...
     
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  7. Kevin W.

    Kevin W. Registered User
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    Great looking clock, i love those IBM clocks, i have a master IBM and i really like it, nice to see others around.
     
  8. Scot Traffis

    Scot Traffis Registered User
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    Apr 8, 2011
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    I have four masters with mercury pendulums, two with glass jars and two with sealed metal tubes. I always worried about broken suspension springs so I always check them when ever I do any maintain on the clocks.
     
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  9. paradise

    paradise Registered User
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    Jun 24, 2007
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    I have the same case on a motor wind IBM and for all my looking it seems to me to be a Stromberg case with beveled glass all around and a 14 inch dial. I also have a few motor wound glass jar pendulum clocks. I rigged a setup somewhat similar to a Seth Thomas tower clock whereby if the suspension spring breaks it will catch the pendulum before it falls more than a quarter inch. I would imagine y'all can improvise something that does that and let me tell you it takes away a lot of the worry about mercury spill. It does not affect the movement of the pendulum at all.
    Just look at a ST tower clock up near the suspension spring.
     
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  10. Joe B

    Joe B Registered User

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    Alright so here's the update - I replaced the suspension spring with an exact replacement I found and replaced the mercury jars. The clock, at the fastest pendulum position, continues to run slow. I do notice that the mercury vials are a bit low on mercury, do you think that would case the clock to run too slow? (I've got to brush up on my physics)

    IMG_8363.JPG
     
  11. Scot Traffis

    Scot Traffis Registered User
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    The jars on my clocks are filled to about 3/4" from the top
     
  12. Joe B

    Joe B Registered User

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    Huh, so mine are a little low but I wouldn't think that would have such a large impact on running speed. Though I guess 2 more pounds of mercury would make a difference.
     
  13. fdew

    fdew Registered User

    Jul 12, 2007
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    It isn’t the weight of the mercury that is throwing it off, it is the location of the center of mass of that mercury. If the jars are 1/2 full and are 7in tall then the center of your weight has moved down about 1 3/4 in. That is a lot.
     
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