Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 36
heated thehottest. To overcome this trouble the wire should be con- 32 IRON AND STEEL. stantly rolled in the flame in order to heat all sides equally,and it is always best to plunge the piece into the oil orwater lengthwise and do it very quickly. The oxygen of theair unites with the steel on its… … Fig. 3—-Steel hardened at lowest possible heat (dull cherry red). cause of the oxide, and if we can heat the piece without itscoming in contact with the air, we can accomplish the de-sired result; this may be done by heating in a copper tube orthe bowl of a clay pipe and filling the tube or pipe…
Clocks and watches
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