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 22
n tooth and pallet, are directly responsible for the blowgiven to the roller jewel by the slot in the fork. 111. Angles Shaping the Pallet Jewel.—The angles which con-trol the shape of a pallet jewel are three in number. These threeangles arise from three different points, namely, the pallet… … angle. The impulse angle in conjunction with the angle of width,viz., PEG (Fig. 7), defines B C, the pallets impulse face. 113. Angle of Width.—The width of a pallet jewel is governedby the size of the angle F E G, the point of origin of this anglebeing the escape wheel center E (Fig. 7). 114.…
Clocks and watches
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