Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 37
elicate articles are oftenhardened in this manner after which they can be temperedwithout being obliged to polish them. Let us now carefully examine the photographs here re-produced. Figs. 1, 2 and 3 were made from the same pieceof steel, a rod 5 millimeters in diameter, in order to show 33 MODERN… … Fig. 4—Wrought iron showing grain. at all. We have in ^his short piece of rod all stages, from thebadly burned to the most perfectly hardened steel possible. The rod was easily broken at the end and showed a verycoarse crystallized surface as shown in Fig. 1. The grainresembled very much that of…
Clocks and watches
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