A Regency experimental clock movement by William Congreve, dated 1820
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A Regency experimental clock movement by William Congreve, dated 1820

Details
A Regency experimental clock movement by William Congreve, dated 1820
The single chain fusee movement with helical gearing, lever escapement with engraved bridge set vertically within the back plate, maintaining power, signed and dated W. Congreve/London/1820 -- 4¾ in. (11.5 cm.) high; mounted on an ebonised stand
Literature
This unusual movement was illustrated in Antiquarian Horology (June, 1958). A lecture by Cecil Clutton on the movement is published in the same issue.
The principle of helical gearing was known to Robert Hooke (1638-1703) and Johann Helfenzrieder of Ingolstadt suggested its use in clocks in 1789. It was later used in skeleton clocks by Charles MacDowall (1790-1871). The present movement may well be the first time it was used on clockwork.
Special notice
No VAT will be charged on the hammer price, but VAT at 17.5% will be added to the buyer's premium, which is invoiced on a VAT inclusive basis.

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