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 26
th the point Tgives us the line P T. This line marks out the lifting or impulseface of the pallet jewel. The back of the pallet jewel N T issimply drawn parallel to the locking face R P, which completesthe drawing. 21 LESSON 6 THE ESCAPE WHEEL—DRAFTING 120. Escape Wheel Teeth.—The acting parts of a… … being the part which rests on the pallet jewels locking face. Theline A N takes no part in the escapement action, the undercuttingfrom the point A being for clearance between pallet and tooth.This statement, like others, should be verified by the student fromactual observation of an escapement in…
Clocks and watches
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