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Old 23rd May 2022, 8:27 pm   #1
GentlemanJohn
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Default ITR London copper clock.

Good evening. I’m in possession of an international time recording clock /London London copper spun clock. It originally came out of a carpet factory called Brintons. I am trying to renovate it and would like any information possible especially with the coils which I have not tested as yet but I can see on them they are 24 V. I would Appreciate if I knew what diodes/resistors are required. Any advice would be greatly received.

Last edited by GentlemanJohn; 23rd May 2022 at 8:38 pm. Reason: Description mistake
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Old 23rd May 2022, 8:36 pm   #2
paulsherwin
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Default Re: Ltr london copper clock

Some pictures would help, particularly of the motor and mechanism.

24V motors would be very unusual in an electric clock. Are you sure they're not 240V?
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Old 23rd May 2022, 9:20 pm   #3
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Default Re: Ltr london copper clock

It's not "Ltr" as the title says, but "ITR" as in International Time Recorders, which became IBM, I think.

Brintons' factory was apparently built in the 1920s, so your clocks probably date from then: https://www.***********/photos/28083135@N06/7139505549

See here for some info on the master clocks: https://clockdoc.org/default.aspx?aid=1903

The "slaves" often worked from 24V DC. I think your clock may be one of these, and needs a specially-timed pulse to drive it. If you don't have a master clock, then little electronic modules are available which work very well:

https://www.ebay.co.uk/itm/114785375...BoCaz4QAvD_BwE

https://www.electric-clocks.co.uk/Im...ockdrivea.html

I have one of the former type driving our big ITR slave clock in the dining room. It works faultlessly, year after year.

As Paul's said, pictures please!

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Old 23rd May 2022, 9:28 pm   #4
Dave Moll
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Default Re: Ltr london copper clock

International Time Recording Company was amalgamated into The Computing-Tabulating-Recording Company (CTR) which, as Nick says, was incorporated into International Business Machines (IBM).
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Old 24th May 2022, 10:56 am   #5
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Default Re: Ltr london copper clock

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Old 24th May 2022, 11:06 am   #6
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Default Re: ITR London copper clock.

Quote:
Originally Posted by Nickthedentist View Post
It's not "Ltr" as the title says, but "ITR" as in International Time Recorders, which became IBM, I think.
Thread title updated.
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Old 26th May 2022, 10:55 pm   #7
mark_in_manc
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Default Re: ITR London copper clock.

ITR slave clocks take a 24v pulse every minute. They have three wires connected to the slave unit, which are switched by a microswitch operating on the hour (at least mine do, from 1960s). If this is the case, you might find things easiest if you re-wire the slave coil just across two wires and neglect the microswitch. But mine also use a semiconductor diode in the slave, which yours will not, so perhaps they are very different!
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Old 15th Jun 2022, 6:49 pm   #8
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Default Re: Ltr london copper clock

Thank you everyone for your information has been greatly received. I am rather busy at the moment and I’ve just read all the messages given to me. Once again thank you very much most appreciated.
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