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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 132
gth, or radius of roller jewel, or both. Statement No. 3—Drop locks correct. Levers length short(or roller jewels radius short). Result shown by test. Eachtooth shows too much contact with its pallet jev/el. (See Fig.3L) Remedies—To establish proof-findings, increase levers length,or roller jewel… … Fig. 30 Remedy—To establish proof-findings increase the drop locks.Btatement No. 5—Drop locks deep. Levers length correct. 75^Clocks and watches
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