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 21
ally prefers an arc of 450 to 540 degrees. Thevibratory arc, however, should not exceed 540 degrees, else thereis danger of developing a banking error. An examination of thehighest grade watches will reveal the fact that arcs of 450 degreesare most favored. 16 LESSON 5 PALLETS—CIRCULAR, EQUIDISTANT… … and locks. Notice the slant of A B away from the point B.A B is shown as an inclined plane.. The purpose of this slant isto help draw the pallet jewel deeper into the escape wheel and tohold the lever against its bank. The force which produces theeffects just mentioned is termed draw. That part of…
Clocks and watches
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