Canadian Jewellers Association · Toronto : Maclean-Hunter Pub. Co · leaf 460
Fig. 3. … Fig. lg- 3 When subjected to cold the arm contracts while thefree ends of the rim are thrown outward. Fig. 4. Thus thefree ends correct the errors resulting from change of temperatureon the metal of the wheel, but as before stated the greater partof the error is chargeable to the hairspring. The…
Jewelry · Jewelry trade
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