Under the Loupe/The Swiss Lever Escapement

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The Swiss Lever Escapement
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A view of the backside of the anchor of a Swiss Lever Escapement
While more than 200 varieties of escapement have been invented since the middle of the last millennium, it is the anchor shaped, Swiss take on the lever escapement that dominates the arena of modern, portable timepieces.

The lever escapement was first invented in about 1765 by Thomas Mudge. It is so called because it is a mechanism in which the transfer of energy between the escape wheel and the balance wheel is communicated by means of two levers. In the Swiss lever escapement one of these levers is formed by the fork which holds the pallets. The second lever is in the form of a roller, which surrounds the base of the balance staff, with a pin projecting along a radian from the balance staff's center.