The seconds circuit connects in series just like the half minute circuit. Note that it is designed to run a 75 mA in the seconds circuit - not the 330 mA of the half minute circuit. The adjustments (f

As far as I know, all of the gathering arms were ‘nominally' the same length. However, I have encountered clocks, especially pre WW1 ones that had minor differences (the gravity arm and latch underwen

Well done on getting your clock running again. From the serial number, assuming it is a MkI clock, it would date to around 1946 and be in a ‘flat top’ case. I have an Ex TR Synchronome from around 195

The StAlbans clock still runs and has had recent overhaul work apparently. https://en.wikipedia.org/wiki/Clock_Tower,_St_Albans

You don’t say where in the world you are but, as a guide; Suspension springs such as Gents, Synchronome etc. are easily enough made from shim stock. I’m not aware of an ‘off the shelf supplier’, but I

It sounds like the salve movement for the pilot dial in the master is ‘missing’ a few pulses. This is likely to be a minor adjustment issue. There are some guidelines to adjusting these slave movement

I use 6BA washers as ‘fine tuning’ weights on the tray. I would caution though against having too high expectations. A Synchronome is pretty good …. but not perfect. If you are looking for an accuracy

The spring is a spiral wound (the full length of) the ‘axle’ on which the latch pivots. The light is poor, so the photo is not very clear, but it is a torsion spiral would spring of numerous turns. Th

Hi Phil, I believe a spring is ’normal’. My clock (Fig 4/6 in Bob’s book I believe) has a spring. This is a long spiral spring would round the latch pivot. Image attached John

I am gathering data about Synchronome Minute Masters. These clocks, made between circa 1960 and 1970(ish) have a 3/4 second pendulum, Hipp toggle pendulum drive and a 1 minute single polarity impulse.

Yes. The pilot dial is connected in loop 1 (called the home loop) and controlled in the same way as the other loops. It is done in quite an unusual way. There is an explanation of how it works on page

The Synchronome distribution board does exactly that. I put back my system yesterday (about 30 dials in 6 circuits via a 6 channel distribution board. I switched all 6 dial circuits to “ADVANCE”, but

Perspex is quite a hard shiny surface and works well John

I don’t have an extra glass backstop, but have successfully used perspex (very easy to buy a rod and to drill/machine) and works perfectly - looks like glass. John

A few ideas. The jewel and countwheel teeth should run dry - NO oil. The teeth faces and slopes need to be very clean. The jewel should ‘just’ engage the tooth enough top pull it round - no more. It i

I have a question from a non internet connected collector. We are generally familiar with the following styles of Synchronome cases for MkI clocks, with various sub-divisions. These are divided as fol

Hi Grant, I had failed to note earlier that I think you may be in Australia? There is an active AHS (Antiquarian Horological Society) Electrical Chapter in Australia and they may well be able to give

Firstly, I don’t believe you have either 29, or 99 as a ‘true’ serial number for that movement. The reason is that 29 and 99 are VERY low numbers dating to circa pre 1910), and the features on your cl

The correct adjustments are given here; https://ahsoc.contentfiles.net/media/assets/file/AHS_EHG_Technical_Paper_No_22_-_Synchronome.pdf

As a further thought, is it possible that the large movements - that would be installed very often large existing dials might have the resistor fitted by the installer when completing the installation