The No.4

This post was written by Jonny Flower

It’s really not every day that a dealer in horological objects gets to make a once-in-a-lifetime report. But, to the door of number 4 Lovat Lane, London, residence of the AHS, to convey news of a handsome discovery! Buried under decades of dust in a darkened room it has been found! Behold…the Synchronome No. 4, which came to me as part of the estate of an electrical engineer.

In photos it looked like it might be a self constructed version, especially with the blue Hammerite paint on the frame. Upon seeing it however, it was obvious that it was factory built.

It was smaller and more delicate than usual Synchronomes and the carvings in the upper door frame were sunrise style, not floral. A very early Hit and Miss synchroniser shows that at some stage it was connected to another Master clock, possibly a Shortt tank.

Synchronome No.4. Note the sunrise carving in the upper door.

Once the synchroniser had been removed the bronzed NRA plate engraved with the magical No.4 appeared, one of the very first production Synchronome one-second master clocks.

No pilot dial was evident. The movement had separate footed cocks for the count wheel, latch and the gravity arm. The coils were attached to an L-shaped projection from the main frame casting. The pendulum has a typical steel trunion with adjustable brass sleeve, delicate brass weight tray and a nicely made lead filled bob with small brass shaped rating nut. The impulse pallet was of a shape I had not seen before with stepped sleeve, lipped tip and a separate screwed on support plate for the gathering wire and jewel.

The mahogany case was a design that was used for the early prototype clocks with brass frames and used before the adoption and incorporation of pilot dials.

After all these discoveries I consulted friends and colleagues together with all the books and literature to establish where No.4 sat in the time line of Synchronome production. What came to light was that there was a fundamental change in the construction of the one-second master clocks very early on in their production. In Bob Miles’ excellent book on Synchronome he had noticed this too.

The bronzed NRA plate, clearing showing the number 4.

This first series of numbered production models I am going to call the Interim Series. The Interim Series of one-second master clocks can be distinguished as follows:

Frame: We know from physical evidence that from serial number 4 up to and including number 41 the cast iron frame had an L-shaped protrusion to support the coils and armature pivot plate.

Movement: Footed brass cocks are used for the Count wheel and gravity arm. The latch used until 1920 is positioned on an adjustable brass frame that is screwed to the back plate.

The back stop is a jewel with a coiled spring-like counterweight that pivots through a pillar attached to the inside of count wheel cock.

No.4 has a case that was used for the brass movement prototypes with a narrow trunk, pediment top and sunrise carvings in the upper door frame. Uniquely at this point in time it is the only one with a door that has the hinges located on the left hand side. No.41 Has a flat topped case with glazed sides. I believe that this Interim Series was a very small production run of approximately 50 pieces with smaller cases and no pilot dials.

My thanks go to John Fothergill and James Kelly for their help, and of course to the late Bob Miles. I am pleased to report that No. 4 will soon be joining the collection of The Clockworks museum in South London.