The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . 71 Chronometer Escapement. normal state induces another vibration; the wheel is again unlocked andgives the impulse pallet another blow. Although the balance only gets impulse in one direction, the escape-wheel makes a rotation in just the same time as with a lever escapement,because in the chronometer the whole space between two teeth passes?every time the wheel is unlocked. By receiving impulse and having to unlock at every other vibrationonly, the balance is more highly detached in th
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . 71 Chronometer Escapement. normal state induces another vibration; the wheel is again unlocked andgives the impulse pallet another blow. Although the balance only gets impulse in one direction, the escape-wheel makes a rotation in just the same time as with a lever escapement,because in the chronometer the whole space between two teeth passes?every time the wheel is unlocked. By receiving impulse and having to unlock at every other vibrationonly, the balance is more highly detached in the chronometer than inmost escapements, which is a distinct advantage. No oil is required tothe pallets and another disturbing influence is thus got rid of. If prop-erly proportioned and well made, its performance will be quite long as it is not subjected to sudden external motion or jerks. Formarine chronometers it thus leaves but little to be desired, and even forpocket watches it does well with a careful wearer; but with rough usage. Fig. 62. Fig. 63. it is liable to set, and many watchmakers hesitate to recommend it onthis account. It is much more costly than the lever, and would only beapplied to very high-priced watches, and in these the buyer naturallyresents any failure of action. Its use in pocket pieces is therefore nearlyconfined to such as are used for scientific purposes, or by people whounderstand the nature of an escapement, and are prepared to exercisecare in wearing the watch. There is another reason why watchmakers,as a rule, do not take kindly to the chronometer escapement for pocketwork. After the escapement is taken apart, the watch does not so surelyyield as good a performance as before. In fact, it is more delicate thanthe lever. Chronometer Escapement. 72 CONSTRUCTION AND PROPORTION OF THE ESCAPEMENT. For the ordinary 3 inch, two-day, marine chronometer movements^three sizes of escape wheels are used—viz.: .54, .56, and .58 of an inch in
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