If you have Facebook access, there is a private group called Synchrome, which might be worth a look
https://www.facebook.com/groups/405744970060647/

What make is the clock? I have a couple of ex GPO master clocks, but they are Gents which seem to be a different mechanism.
LightStraw has lots of synchrome clock info, so it’s worth visiting for general ideas.
https://www.lightstraw.uk/gpo/clocksystems/pages/docindex.html~
Most of the lines in the document index form a hyperlink to the spec.

See also on eBay for some photos
https://www.ebay.co.uk/itm/374164722350

or if you have a Flickr account, and thus FlickrMail
Have a look HERE, which should display for non account holders.

What is EHG Technical Paper 43 ?

Bill

Michael, I have a quantity of 0.5mm BeCu shim, happy to supply some for the suspension.  Basically I think there will be brass cheeks soldered on each side at each end with a soldered transverse pin to fit the hooks.  You could also cut the material into thin straps for the other spring depending on the length you need.  I have several metres of 2 inch wide material, sent free as a sample!  More than I could ever use in my lifetime.

You might like to make contact with The Clockworks at West Norwood who have a collection of mainly electrical clocks.

CS

Looking back through the thread I gave duff info – the shim I have is 0.1mm!

In case you are not aware of it, this site:

https://wp.clockdoc.org/

…has a huge amount of information on electric clocks including TR clocks with lots of photos.

On 6 June 2024 at 16:54 Michael Gilligan Said:

On 6 June 2024 at 14:35 Clive Steer Said:

You might like to make contact with The Clockworks at West Norwood who have a collection of mainly electrical clocks.

CS

Thanks also to you, Clive

James Nye, thereof is Chair of the AHS, and also heads the EHG

I specifically asked here because there are some ex-telephone people on this forum and I had already drawn blanks elsewhere.

MichaelG.

Just found this.

CLOCKS (taken, with acknowledgement, from the Clock Museum web site)
The Telephone Manufacturing Co Ltd used the trademark Temco for their synchronous and other electric master clocks circa 1935.  Further information provided by courtesy of James Nye (using in part info from the EHG Technical Paper 43).  TMC went public as the Telephone Manufacturing Company (1920) Ltd and The Telephone Manufacturing Company Limited (TMC) was formed in 1924.  After a re-organisation of activities as the Telephone Manufacturing Co. 1929 Ltd.  By 1929 it had absorbed New Systems Private Telephones Limited, which became a subsidiary company and was later renamed Telephone Rentals Limited.  Production of Temco synchronous clocks appears to have started in about 1931 and ended some time after 1952.  Around the same time TMC absorbed Prince’s Electrical Clocks Limited.  The re-engineered Princeps clock became what we refer to as the Princeps New System.  Chronomatic was registered as a trade name in 1935 and frequently appears on the dials of clocks which were also rented out by Telephone Rentals Limited.  The mechanism was moved from its low position to the top of the case in the 1950s, and became known as the High Impulse Transmitter, continued in manufacture until the 1970s.  Telephone Rentals also installed other manufacturer’s equipment, and latterly traded under the name TR Time Services Limited, disappearing within Mercury Communications in April 1990.  During its history, TR acquired Dictograph, another firm that specialised in rentals, mainly of Magneta M36/M37 master clocks.  Telephone Rentals and Dictograph [like many other firms in this business] had a deliberate policy of destroying equipment that came back from rental, I am told usually after two contracts, 30 years at most), and there are therefore far fewer surviving examples of what were once amongst the most commonly installed systems.  For example, the production rate of Magneta clocks was nearly double the annual total of Gent’s.

TMC had several locations, but one main works was at Park Hall in West Norwood, west of the cemetery.  Robson Road runs down the side of the cemetery from Norwood High Street towards the works, and the staff going to work each day down Robson Road referred to it as ‘walking the wall’.  Several people who still live in West Norwood worked there or had relatives that did.

Colin Reynolds, formerly of Gents, has also written to tell me: “Gent used to manufacture master clocks, time products and fire alarm products for Telephone Rentals and badge them with their logo.  I remember designing a fire alarm equipment for them.  They rented out electrical equipment and supplied the service for its maintenance and at Gent we had engineers visit the factory for training.”

Hi Michael

Your “continuity spring” looks very much like those used in speedometer. I have quite a few but I know some who has even more. If you can publish what size the collet is and the approximate spring diameter I’ll see if I can find a suitable replacement.

Clive