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IBM IBM Master clock 1920's?

Kett71

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Aug 23, 2018
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hi new here, recently bought this IBM time clock or wheel clock . it has no no tag or serial number i can find. would like to know as much as i can . believe i just need a pendulum and a battery and it should work. the case is 65"x20"x8" was told it is capable running of 24 slaves. 12" face theres a small plate on the bottom that says model 2040. i couldnt make that number match anything. from the tip of the part the pendulum attaches to , to the top of the scale at the bottom is 39.5" how do i know how long of a pendulum i need? thanks for any and all info... Shane 20180823_105252.jpg 20180823_112633.jpg 20180823_150117.jpg 20180823_083402.jpg 20180823_150117.jpg
 

etmb61

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Oct 25, 2010
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That's a beauty! I really like the wood bezel around the dial. I would think that 2040 is the serial number. You probably need a seconds pendulum, about 39" I think.

Eric
 

Kevin W.

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Apr 11, 2002
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Hi Kett, and welcome to the forum. What part of Canada do you live in. I have a IBM master clock and its pend length is 39 inches, kind of surprised it does not have a plate attached to case showing model and ser number. I dont see any weights, is yours spring driven, very nice clock by the way, my clock is a master 35-7
 

Kett71

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Aug 23, 2018
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yes its is spring driven and auto winds with , well used to be 24 volts from what i tell from threads on here. some one else posted about a kit i believe so the will work on AC voltage. i heard the original pendulum to these clocks were very heavy . like 5-10 pounds finding a pendulum is my main concern first. . i live just outside windsor ontario/

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John Lippold

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Feb 2, 2011
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"Hi new here, recently bought this IBM time clock or wheel clock. It has no no tag or serial number i can find. would like to know as much as i can . believe i just need a pendulum and a battery and it should work. the case is 65"x20"x8" was told it is capable running of 24 slaves. 12" face theres a small plate on the bottom that says model 2040. i couldnt make that number match anything. from the tip of the part the pendulum attaches to , to the top of the scale at the bottom is 39.5" how do i know how long of a pendulum i need? thanks for any and all info... Shane"

Hi Shane, Please post photos of the top of the clock where the wire terminal connections are and of the bottom inside of the clock case so I can see what type of hardware this clock is configured with... Thank you, John
 

Kevin W.

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Perhaps the Toronto Chapter is closest to you, if you were perhaps thinking of getting some help for your clock. Yes the pendulum on mine is invar and i believe 10 pounds if i remember correctly.
 

Kett71

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Aug 23, 2018
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thanks for info on the pendulum, not anything attached to the top of the clock. except on the outside on top there are 2 square bakelite blocks for 2 wires in and 2 wires out. plus 2 just behind the clock face and the plate attached to clock works. plus a network of wires running all over the back. theres 2 more of thoses blocks (same size) behind the day and time wheel in the middle and those , im not sure solenoids or compacitors or either side under the wheel.

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JAB60

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Nov 13, 2016
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Kett71. I sent you a PM.

Encyclopedia > view feeds > conversations.
 

John Lippold

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Feb 2, 2011
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Shane, thank you for posting the additional photos. Your clock is an IBM 60 beat master clock and it is able to drive secondary clocks. If it were a US made clock it would probably be a model "C". Canadian clocks seem to have different model and serial numbers than their US made brethren. The hardware your clock contains is period correct for a clock made in 1920. I believe the 2040 number in your clock is the serial number. The first two numbers (20) indicating the year of manufacture. The wheel type program device, like your clock has, was used in the teens and up to mid 1920's in some of the program clocks. I have only seen one other master clock with the wheel type program device and it was dated April 1918. IBM did not recommend installing any other hardware in the master clock case but preferred to sell a separate box where the relays, program devices etc. would be located.

Early master clocks often used lower voltages such as 3, 6 or 12 volts dc so be careful not to damage any of the components of your clock.

I measured two IBM 60 beat pendulum sticks and they both were 43 1/4 inches long from the top hook to the bottom of the adjustment screw. The bob is 8 inches in diameter and the total weight of the assembled pendulum is 5 lbs. and 7 oz.

You need to trace out and record the clocks wiring so you can determine what the push buttons and switches are for which are located in the bottom of the clock case. Doing so will help determine where you connect supply power to your clock and what the program device was used for.

Enjoy your clock,

John

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fdew

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Jul 12, 2007
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What a wonderful and OLD master I suspect the switches at the bottom are to turn on or off each of two Chanels of bells, and to ring them manually. The two black things are relays. The contacts on the bell wheel entergise them and there contacts send power to the bells.
 
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