. Watch and clock escapements; . scapements. and establish the point v, which defines the extent of the angularmotion of the escape wheel utilized by pallet. Through the point v,from B as a center, we sweep the short arc m. It will be evidenton a moments reflection that this arc m must represent the path ofmovement of the outer angle of the exit pallet, and if we measuredown ten degrees from the intersection of the arc / with the arc m,the point so established f which we name the point s) must be theexact position of the outer angle of the pallet during locking. Wehave a measure of ten degrees
. Watch and clock escapements; . scapements. and establish the point v, which defines the extent of the angularmotion of the escape wheel utilized by pallet. Through the point v,from B as a center, we sweep the short arc m. It will be evidenton a moments reflection that this arc m must represent the path ofmovement of the outer angle of the exit pallet, and if we measuredown ten degrees from the intersection of the arc / with the arc m,the point so established f which we name the point s) must be theexact position of the outer angle of the pallet during locking. Wehave a measure of ten degrees on the arc m, between the lines B gand B k, and by taking this space in the dividers and setting oneleg at the intersection of the arc / with the arc m, and measuringdown on m, we establish the point s. Drawing a line from point nto point s we define the impulse face of the pallet MAKING AN ESCAPEMENT MODEL. It is next proposed we apply the theories we have been con-sidering and make an enlarged model of an escapement, as shown. at Figs. 24 and 25. This model is supposed to have an escapewheel one-fifth the size of the 10 one we have been drawing. Inthe accompanying cuts are shown only the main plate and bridges The Detached Lever Escapement. 4i in full lines, while the positions of the escape wheel and balance areindicated by the dotted circles / B. The cuts are to no precisescale, but were reduced from a full-size drawing for convenience inprinting. We shall give exact dimensions, however, so there willbe no difficulty in carrying out our instructions in construction. Perhaps it would be as well to give a general description of themodel before taking up the details. A reduced side view of the 1 1 — Fig. 25 complete model is given at Fig. 26. In this cut the escapementmodel shown at Figs. 24 and 25 is sketched in a rough way at R,while N shows a glass cover, and M a wooden base of polished oakor walnut. This base is recessed on the lower side to receive aneight-day spring c
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Keywords: ., bookcentury1900, bookdecade1900, bookidwatchclockes, bookyear1904
