Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 96
her. 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 heated to a cherry red and cooledin water. If we can prevent the oxygen of the air oxidizingthe steel… … Fig. fully polished by hand, when they can be nicely blued on alarge flat piece of copper, which is evenly heated. We willnot find it necessary to make springs often, yet it is impor- 93 MODERN METHODS IN HOROLOGY. tant to understand how it is done. We will now endeavorto explain duties they are…
Clocks and watches
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