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One of George Daniels's central contributions to horology is his co-axial escapement. Having observed that the dominant lever escapement begins to change its rate after a year or two -- a disturbance caused by the sliding action of the impulse elements of the escapement -- Daniels set about developing a mechanism that avoided this problem. The result of his efforts was the co-axial escapement, a mechanism in which he sought to combine the strengths and eliminate the deficiencies of existing watch escapements, the lever escapement foremost among them. First devised in 1977, today it remains largely the same as fitted in watches of Daniels's own manufacture, as well as those of several wrist-watch manufacturers. This book explains the action of the escapement in terms accessible to both expert and layman, and is accompanied by a series of detailed line drawings.
George Daniels, MBE, DSC (HONS), FSA, FCGI, FBHI, FAWI is a practicing horologist with over fifty years experience in both antiquarian and modern watchmaking, and is a pastmaster of the Worshipful Company of Clockmakers. Amongst his awards for contribution to the art and science of watchmaking - including the design of his own escapements - are the Tompion Gold Medal, The British Horological Institute Gold Medal, The City and Guilds of London Gold Medal, The Arts Sciences and Learning Award of the City of London, and the Victor Kullberg Medal of the Stockholm Watchmakers’ Guild.
Table of Contents
Foreword * Introduction * General Principles * Verge Escapement * Cylinder Escapement * Virgule Escapement * Duplex Escapement * Lever Escapement * Escaping Angle * Lever Angle * The Draw Angle * The Balance Roller * The Pallets and Escape Wheel * Detent Escapement * The Unlocking Angle * The Angle of Draw * The Locking Stone * Pivoted Detent * The Impulse Angle * Radial Impulse at Each Vibration * Robin Escapement * Echappement Naturel * Summary * Detached Escapements without lubricant * Independent Double Wheel Escapement * Double Radial Impulse with Single Wheel * Co-Axial Escapement * Extra Flat Co-Axial Escapement * Symmetrical Co-Axial Escapement * Photographic Plates