time to re- charged with diamond dust. Fig. 12. Fifty or more of the punchings are assembled duce the diameter of the balance, so as to exactly adapt The Hair Spring.—The duty of the hair spring on a split arbor, B, which is placed between the cen- it to the force which the weakened spring is… … or farther from the ends, we can change the of which are so fine as to call for a magnifying 15.—Watch-hand Polishing Machines. effective weight of the rim in respect of vibra- glass to discover at which end is the head and tion. For a screw placed near the supporting at which the thread. The wires…
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