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| blade wrapped in stainless steel foil |
blade and combustible ready to wrap |
ready to close up |
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 |
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| sealed blade, edges pounded |
plate quenching |
cooled blades on aluminum plate |
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 |
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| clamping aluminum plates on hot blades |
heat-treat furnace |
blades in furnace |
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 |
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| furnace glows orange |
removing after soaking at quench temperature |
opening blade |
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 |
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| heat-treated blalde |
cooling blades |
blades ready to be tested |
 |
 |
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| self-explanatory |
testing the hardness of each blade |
testing on the Rockwell C scale |
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|
|
| closeup of measurement |
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|
