The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . -tion. The balance is never detached, but the roller on which the wheelteeth rest is very small and highly polished, so that there is but verylittle friction from this cause, and the alteration in its amount, is, there-fore, not of such consequence as might be imagined. A very usual pro-portion is for the diameter of the roller to be one-fifteenth of the diameter,of the largest part of the escape wheel, which it intersects about 30° 133 Duplex Escapement* measured from the center of the
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . -tion. The balance is never detached, but the roller on which the wheelteeth rest is very small and highly polished, so that there is but verylittle friction from this cause, and the alteration in its amount, is, there-fore, not of such consequence as might be imagined. A very usual pro-portion is for the diameter of the roller to be one-fifteenth of the diameter,of the largest part of the escape wheel, which it intersects about 30° 133 Duplex Escapement* measured from the center of the roller. The impulse teeth should haveconsiderable drop on the pallet. Ten degrees is not an unusual scape wheel is made as light as possible, of hard hammered brass ofvery fine quality. The points of the impulse teeth are usually two-thirds the distance of the points of the locking teeth from the center ofthe wheel. The impulse pallet is sometimes jeweled. The staff requires to be planted with great exactness, and one of themost frequent causes of derangement of the Duplex Escapement is the. Fig. 116.* wearing of the balance pivots. In such cases, the pivots having beenre-polished, new holes, or at all events a new bottom hole, should be putin. See also that the point of each locking tooth is smooth and nicelyrounded, and that every impulse tooth falls safely on the pallet; if someare shallow, twist the impulse pallet round so as to give more drop. Orif the roller depth is also shallow, carefully make the teeth of equallength by topping, and then, supposing it to be a full-plate watch, very a. Escape Wheel. b. Impulse Locking Teeth. d. Impulse Teeth. e. Ruby Roller. Duplex Hook. 134 slightly tap the cock and the potance towards the wheel until the escape-ment is made safe. In a three-quarter plate the recess for the jewel set-ting may be scraped away on one side and rubbed over on the extra amount of intersection of the impulse pallet in the path
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