Practical lessons on the lever escapement, its tests, errors, their detection and correction (1916)
Wilkinson, T. J. (Thomas Jessop), b. 1864 · Philadelphia, Penna., Technical publishing company · leaf 36
ith the type of escapement. For a thorough understand-ing of the variations of this angle, either under normal or bankedto drop conditions, the reader is referred to that portion of thisbook treating on the safety action and its tests. This also appliesto the requirements of the various escapement… … lengthy and somewhat intricate subject, best mastered frompractical experience as outlined in our tests. 146. Crescent or Passing Hollow.—The provision of a crescentor passing hollow cut into the edge of the roller enables theguard pin to pass from bank to bank without touching any partof the…
Clocks and watches
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