. Rules and practice for adjusting watches . Fig. 13 The Adjustment to Isochronism and Positions. Fig. 14 the pendant down position where it will be the leastdetrimental to the performance of the watch. 34. The NaturalPosition Errorand Why itC annot beEliminated. The natural er-ror generally con-sists of fromtwelve to fifteenseconds in finelyconstructedwatches, and ex-ists because of thefact that it is im-possible to per-fectly poise a spi-ral spring. Thelocation of the heavy point, however, may be shiftedby changing the point of attachment at collet asdescribed in No. 33, this Chapter. The ne
. Rules and practice for adjusting watches . Fig. 13 The Adjustment to Isochronism and Positions. Fig. 14 the pendant down position where it will be the leastdetrimental to the performance of the watch. 34. The NaturalPosition Errorand Why itC annot beEliminated. The natural er-ror generally con-sists of fromtwelve to fifteenseconds in finelyconstructedwatches, and ex-ists because of thefact that it is im-possible to per-fectly poise a spi-ral spring. Thelocation of the heavy point, however, may be shiftedby changing the point of attachment at collet asdescribed in No. 33, this Chapter. The nearestapproximation of a poised spiral spring is probablyattained through L. Lossiers inner terminal are not positive, however, and any deviationfrom the required precision makes the curve value-less. It is possible to obtain perfect adjustmentbetween three vertical quarter positions ani thetwo horizontal positions, but all four quarter posi-tions cannot be perfectly adjusted because thenatural error will show up in one of them. Manufac-turers of fine watches do not of course pre
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