The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . the pitch with the locking faces if necessary, andthus, while diminishing the effect of viscosity on these surfaces, to in-crease the real lift that corresponds to a given apparent lift. Lastly, thedrop can be reduced to almost nothing. It is undoubtedly true that, as a set off against these advantages, it maybe objected that this escapement is of a highly scientific character, so thatits construction is a matter of some delicacy, and requires the skill of afirst-rate workman. In conclus
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . the pitch with the locking faces if necessary, andthus, while diminishing the effect of viscosity on these surfaces, to in-crease the real lift that corresponds to a given apparent lift. Lastly, thedrop can be reduced to almost nothing. It is undoubtedly true that, as a set off against these advantages, it maybe objected that this escapement is of a highly scientific character, so thatits construction is a matter of some delicacy, and requires the skill of afirst-rate workman. In conclusion, Saunier says, that the advantage ison the side of the clubbed tooth. ?Saunier does not commit himself on this point; Glasgow and Britten both declarethat there is no advantage in the straight line, though the former admits that it maybe more handsome to look at, and the latter that it allows of the poising of the leverand pallets with less redundant metal. The principal reason why it is not made inCngland is that with the fuzee movements it is difficult to find room for it. Lever Escapement. 218. Britten says that, on the other hand, English watchmakers maintainthat as at some time durini^ each impulse the planes of the wheel andpallet nearly coincide, the increased surface then presented to the vary-ing influence of the adhesion of the oil is a serious evil. Then with clubbed teeth, there is moredifficulty in satisfactorily re-placing a wheel than withratchet teeth, for in theformer case the planes mustbe of exactly the same angleand of the same length inthe new wheel as in the oldone. With brass wheels, theimpulse faces on the wheelFig. 196. get cut into ruts, but the Swiss avoid this by using steel wheels, and also much reduce theextra adhesion due to increased surface by thinning the impulseplanes of the teeth. Swiss escapements are, as a rule, commendablylight, but the levers are disproportionately long. The Germans makean escapement in which the whole of the impulse
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