An interesting and unusual 30 hour longcase
A very unusual clock made its way into my workshop recently, suffering from striking issues. The problem was simple, The locking detent had fallen off the lifter of the pin type countwheel, and a new piece was to be made and rivetted into place. What is interesting is the layout of the movement.
The movement has not been stripped and cleaned prior to taking these images
The image to the right is a labeled view of the rear plate.
The three wheeled time train has no centre wheel, Instead the motionwork is driven from the second wheel through an extended arbour through to the front plate. The plates are held apart by two decorative brass pillars at the top, and two plain rectangular steel pillars at the bottom.
The countwheel is on the front plate and is of the pinned type, whilst the hammer arm is pivoted at the bottom of the movement and runs the full height of the plate.
A decorative cut out at the base of the rear plate is another unusual feature and seems to serve no physical function.
The anchor, which can be seen here between the plates, is of a very unusual shape.
It is a recoil type excapement, pivoted at a far greater distance from the escapewheel than usual, and consequently embraces 14 and a half teeth rather than a more convensional 7 or 8 and a half.
I can see no benefit for this other than to allow for clearances of the unusual lay out of the train. It is most likely just a random design choice or the usual manner for this particular maker.
The maker is listed by britten as both a clock and watch maker. John Morgan of Monmouth had a short (known) carreer between 1751 and 1757. Making this movement over 250 years old, which is evident in the condition of the brass plates. Stress cracks have propegated along the front plate over the years.