Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 39
e sur-face. Each color denotes a certain hardness, as follows:1. Very pale straw. 6. Light purple. Straw. 7. Dark straw. 8. Brown yellow. 9. Purple. 10. ^ 35 Dark purple. Dark blue. Light blue. Pale blue and green. MODERN METHODS IN HOROLOGY. The Erst two are too hard to file and denote the… … Fig. 6—Steel highly polished. be observed, even a finger mark being sufficient to prevent acolor that otherwise might have been perfect. The finer and brighter the polish before tempering, thebetter and more even the color will be. If we temper an article without its coming in contact withthe…
Clocks and watches
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