American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 276
of strength. For thereasons mentioned above, the back pivot shouldbe exactly the same diameter, and although theeffects of friction will be slightly greater whenboth pivots are of an equal size, still the forceof the weight will be transmitted more regu-lar, which is the object aimed at. Turning… … plan most commonly used, and may be made ofeither steel or gpod hard brass. Brass is thematerial oftenest used, but on special occasionsthey are sometimes made of steel. Whenmaking one of this pattern the first thing to bedone is to turn a groove in the barrel arbor asdeep as the strength of the…
Clocks and watches
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