American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 270
Fig. L … 2G2 AMERICAN HOROLOGICAL JOURNAL. describes a larger arc in the same time thanthe other, and of course the point where theforces of the two balls balance each other liesnearer the lower ball, consequently the pointof percussion does not coincide with thecentre of gravity; but it is that point…
Clocks and watches
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