
Penelope Andrews
Head of Department
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Head of Department
The ruby cylinder was used by Abraham Louis Breguet in the effort to reduce the friction and improve on the inefficiency caused by this type of frictional rest escapement. The working section of cylinder is made of a half tube form of ruby set into two steel plugs which also form the pivots. It was very effective as the ruby could be highly polished giving very little friction to the escape wheel but it is rare as it was expensive and difficult to make.