American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 275
—and there are a great many in thisbranch of the business—I call special attentionto these points in turning a barrel, because, ifthe top of a barrel is of unequal thickness, theweight will pull with unequal force as it runsdown, and if the bearing on the end be out oftruth, the great wheels will… … good and serviceable. A A is the bearing forthe great wheels to rest against; B B is wherethe ratchet teeth are to be cut. There must bea little turned off the face of B B, as is shownin the diagram, so as to prevent the greatwheel from rubbing on the teeth. The spacebetween A A and the barrel…
Clocks and watches
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