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The Congreve Rolling Ball Clock was originally invented by an English scientist Sir William Congreve and patented in 1808. This method of operation of the clock is an alternative to the pendulum. Regulation is achieved by the traverse of a ball along t
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If you do not konw what size to buy please use one of our hand ring size guides which can be placed over the finger or used with an existing ring (handy if you want this gift to be a secret) to determine the required ring size.