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 69
Fig. 24 lever away from its bank. This brings the guard-pin in contactwith the edge of the roller (Fig. 25). D—The extent the lever can be lifted off its bank representsthe freedom of the guard-pin from the edge of the roller. CorC^ … Fig. 25 E—A similar test should be made on the opposite side of theroller. The guard freedoms should be equal. 234. Some Incorrect Findings Discoverable by Guard Test—Banked to Drop—Elgin Type,—The subject of incorrect findingsdiscoverable by the guard test is rather too extensive for…
Clocks and watches
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