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 32
he fork angles that angle which separates the guard pin(lever against bank) from the edge of the table roller. 139. Fork Specifications.—Angular motion of lever, IQi^degrees; width of slot, 5 degrees. Acting length of lever toequal the distance between the centers of escape wheel andpallets. The… … 28 centers, A being the pallet center. With A as center, and aradius equal to the distance between the escape wheel and pallets,draw the arc C C. Upon some part of the arc C C the slot cornerswill be located, consequently this arc defines the acting length ofthe lever. The angular motion of the…
Clocks and watches
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