Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 95
theedge of the box as clearly shown. A copper cap fittingloosely into the recess holds the spring flat, while the arboris wound. When the space is completely filled, the top issecurely fastened with coarse binding wire, and the springsare ready to harden. II will be readily seen that we will 91… … Fig. I. wires be used, then every third coil would be the samespring making the coils closer together. In hardening the box containing the spring is coveredwith some substance that will prevent the oxygen of theair from reaching the polished steel while heating, as Pot-assium Cyanide; it is now…
Clocks and watches
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