The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . ell to note the following which is very importantand too often neglected. That is the arrangement of the mainspringin the barrel so as to avoid coil friction The smallest advantage of theold Fusee watch was not the facility ot obtalnmg five turns of the fuseeto three or three and one-half of the mainspring, but being enabledthereby to arrange the latter around a small arbor in such a mannerthat the coils never touched, insuring a smooth motive power andlessening the chances of breakage b
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . ell to note the following which is very importantand too often neglected. That is the arrangement of the mainspringin the barrel so as to avoid coil friction The smallest advantage of theold Fusee watch was not the facility ot obtalnmg five turns of the fuseeto three or three and one-half of the mainspring, but being enabledthereby to arrange the latter around a small arbor in such a mannerthat the coils never touched, insuring a smooth motive power andlessening the chances of breakage beyond estimation. Poising the Balance. In merely poising a balance for a cheap-movement there is no great difficulty, that is, putting it in equipoisesufficient for the reasonably good performance of the movement; but towell and thoroughly poise for a high grade of movement embracesmeans and methods not necessary in the first mentioned. In a cheapbalance a high degree of accuracy is not expected, and so the manipula-tions are, in the poising, simple, provided all the parts are in condition. Balance. 28. to admit of poising. The following will be about all the conditions andmeans used generally: In the outset the balance should be in poisewithout its staff, and this is approximated before the etafE is in by puttinginto the staff socket in the arm a piece of true wire, sufficiently tight toallow of the balance being held onto it with friction, so that the balancecan be trued in the flat by the fingers or with tweezers and remain whilepoising on the parallel bars. Fig. 13 illustrates a form of tweezers made especially for balancetruing. To here explain the parallel bars and give a few points regard-ing the essential features will be well, and help to make clear some points thatfollow in thepoising instruc-tions. The par-allel bars forthe use ofwatch repairerswith the fol-lowing features, will be suited to all the cases metwith: The two bars, if made of steel, for instance,must hav
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