Fine demonstration model of an anchor escapement

Catalogue number #1494578107

Anchor escapement demonstration model	Close-up of anchor escapement	Side view of balance wheel	View of clockwork inside the wood base

Description:

Finely engineered working model of an anchor clock escapement, powered by a robust clockwork mechanism. Mounted on an ebonite board set in a mahogany frame. The mechanism is wound from the top and slowly, but firmly, ticks away for hours. This is a beautifully made precision engineered model circa 1890. The balance wheel incorporates a Breguet balance spring. (A plain spiral balance spring is not truly isochronous,i.e.,will not take exactly the same time to swing through a wide arc as through a narrow one. Breguet discovered that a spiral spring could be made isochronous by bringing an extension of the outer coil in across the other coils and fixing it at a point as near as possible to its centre. Also called an 'overcoil' spring).Overall size 38cm (15")long x 26cm (10")wide x 17cm (7")high. There is a hair crack part way across one end of the ebonite from one edge terminating at the hole though which the escape wheel passes. It can be seen in the first photo as a slightly blacker smear, caused by someone trying to conceal it long ago? May well polish out if it offends. I confess I failed to notice it when I first purchased the item as I was so entranced with the condition and action of the mechanism but I'd have paid the same price regardless - in my opinion this is a very minor defect in an otherwise 'perfect' model. It comes with a modern persplex cover to keep it dust free. Delivery at cost.

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