American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 204
he frictional sur-faces. The consequence of this wear is anexcess of shake of the ratchet and of the wholebarrel. Any defect of this kind is a veryserious one, because the barrel and centre-wheel, the two largest moving parts of thetrain, have, by necessity, their surfaces veryclose to each other.… … of durability. There are only two small an-nular surfaces which constitute the hold ofthe barrel. The shoulder of the arbor, aswell as the edge of the ratchet, wear awaygradually the upper and lower side of thebridge, and the screws slacken their hold bythe numerous little jerks of the click…
Clocks and watches
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