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
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 … Fig. 23 the roller. (2) When the roller jewel touches the curve of thelever horn. (3) When the slot corners of the lever and rollerjewel are brought into contact. For further particulars see guard,corner and curve safety tests. 178. The Banking Pins.—The banking pins are the twoeccentric pins…
Clocks and watches
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