H. R. Playtner, An Analysis of the Lever Escapement: a Lecture Delivered Before the Canadian Watchmakers' and Retail Jewelers' Association, 1910
AN ANALYSIS OF THE LEVER ESCAPEMENT
Found by Grace Andreacchi
The lever escapement is derived from Graham’s dead-beat escapement for clocks. Thomas Mudge was the first horologist who successfully applied it to watches in the detached form, about 1750. The locking faces of the pallets were arcs of circles struck from the pallet centers. Many improvements were made upon it until to-day it is the best form of escapement for a general purpose watch, and when made on mechanical principles is capable of producing first rate results.