New Addition - ITR Weight Driven Motor Wound Master Clock

Joe B

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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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Burkhard Rasch

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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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Joe B

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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.

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Scot Traffis

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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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Joe B

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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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Kevin W.

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Apr 11, 2002
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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.
 

Scot Traffis

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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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paradise

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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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Joe B

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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)

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Joe B

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May 2, 2018
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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.
 

fdew

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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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Ken Sykes

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Feb 8, 2018
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I just acquired the same clock with just the “guts”, no case, weights or pendulum also the weight pulley on the right was missing so I am going to fabricate two new ones. I would appreciate any help in finding parts for this one.
 

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