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 44
D, E and F show the average relative positions of a tooth as ittravels over the discharging pallets impulse face. 39 170. Incorrect Lift.—Not infrequently we encounter liftingactions of an irregular nature, such, for instance, as illustratedin Fig. 17. This drawing shows that the pallet acts on the… … Fig. 17 in -place of the tooth acting on the pallet. In Fig. 18 we haverepresented a disengaging action wherein we again find that thepallet corner is scraping the tooths lifting plane. Errors such as
Clocks and watches
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