English Fusee Bracket Clocks

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The fusee refers to a cone shaped barrel with a spiral groove the invention of which has been attributed to Jacob Zech of Prague in 1525 but probably known before. A line of Catgut or chain is attached to the larger end and the other end to the barrel with the spring in. The purpose is to equalise the power of the spring by pulling on the smaller circumference at the beginning of the week when the spring is at its strongest and pulling on the larger circumference at the end of the week. Fusees were always used on English bracket clocks but rarely on continental clocks.

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