Under the Loupe/The Swiss Lever Escapement
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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.