American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 205
to have a click-work more simple andcheap of execution, and still quite reliable,than this one. 37. For watches, in the execution of which a greater degree of elegance is wished for,the click and click-spring may be exposed byleaving a small annular space round the sinkthat contains the ratchet, on…
Clocks and watches
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