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 47
176. Remaining or Safety Lock.—This is best learned bymaking the following experiment: Bring the guard point of asound escapement into contact with the edge of the roller, thenobserve the tooth and pallet. Whatever amount the tooth remainslocked on the pallet jewels locking face represents the… … Fig. 22 table roller, then the error known as tripping is present. Thisdefect we shall treat on in due course. 177. The Three Safety Locks.—In every escapement a safetylock is required as follows: (1) When the guard point touches
Clocks and watches
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