A Practical and Theoretical Treatise on the Detached Lever Escapement

A complete study of the lever, cylinder and chronometer escapements in theory and practice. Compiled from the Keystone serials with nearly two hundred original illustrations, including a brief account of the origin and evolution of the escapement in horology.

The Keystone

Wilkinson teaches the watch repairer how to read, test and correct the lever escapement. Each lesson covers a specific error, from the draw and impulse angles to the safety roller, with workshop tests for detecting and curing it.

T. J. Wilkinson

A concise geometric and mechanical analysis of the lever escapement, with full plates showing the trajectories of the pallets and the action of the safety roller. Aimed at watchmakers who want the underlying theory of their adjustments.

H. R. Playtner