American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 208
o long (Fig, 13). 49. The springsof this kind havebeen, and may beexecuted, in twodifferent ways. Ac-cording to the one,the thicker part isa part of the springitself; while theother way consistsin adding to asj^ring of the usu-al kind a separate piece of greater strength,equalling in length the…
Clocks and watches
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