Clocks

Clocks

Replication of a Marine Chronometer Gold Alloy Helical Spring: Conservation Project

Posted on 12th June 2018

The marine chronometer signed by John Lilley & son from 1929 has shown evidences of a failure of one of its major components. The helical hairspring which is co-regulating the frequency of the balance (factor determining the rate of the mechanism) was broken by fracture near its lower attachment point. The aim of the project was to provide a replacement spring for the chronometer which would possess the required mechanical properties (toughness, elasticity, shape, composition …).

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