The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . verge, as they lie inthe watch. The width of the pallets apart, from center to center, isequal to the diameter of the wheel. A tooth of the escape wheel is justleaving the upper pallet (c); as it drops off, the under tooth will reach theroot of the lower pallet {d), but the motion of the verge will not be atonce reversed. The escape wheel will recoil until the impetus of thebalance is exhausted. The teeth of the wheel are undercut to free theface of the pallet during the recoil. Generall
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . verge, as they lie inthe watch. The width of the pallets apart, from center to center, isequal to the diameter of the wheel. A tooth of the escape wheel is justleaving the upper pallet (c); as it drops off, the under tooth will reach theroot of the lower pallet {d), but the motion of the verge will not be atonce reversed. The escape wheel will recoil until the impetus of thebalance is exhausted. The teeth of the wheel are undercut to free theface of the pallet during the recoil. Generally in French, and occasionally in English watches, the palletsare even more open. An increased vibration of the balance and less 323 Vernier Caliper. recoil can be obtained with a larger angle, but to get sufficient impulsethe verge must be planted closer to the wheel. This necessitates cut-ting awaj a part of the body of the verge to free the wheel teeth. Then,as the wheel tooth impinges on the pallet almost close to the center ofthe verge, there is more friction on the pivots, and the wheel tooth gets. Fig. 277. so small a leverage that the escapement often sets, unless the balance isvery light. On the other hand, with the opening between the palletsonly 90°, as it is in many English watches, the vibration of the balanceis too small and the recoil too great. An opening of about 100° avoidsthe drawbacks incidental to the two extremes, and may therefore beadopted with advantage. To ensure good performance the body or arbor of the verge should beupright, and when in the frames and viewed through the followerpotence hole, should be seen crossing the balance wheel hole of the dove-tail. The position of the eye should be in a line with the arbor of thebalance wheel pinion when in the follower; the drops of the palletsequal, and the balance wheel teeth true. VERNIER CALIPER. See Gauge. VERTICAL ESCAPEMENT. An escapement in whichescape wheel is at right angles to the balance staff o
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
