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The same arrangement may be used with advantage for tempering small cutters for ornamental turning, penknife-blades, etc., and in these cases the cooler part of the plate is of great value, as it enables the thicker parts to be slowly and equally heated up; the application of a mechanical arrangement to pass the articles to be heated in a regular succession is a matter easily managed.
When we consider that the greater part of the iron thus produced is left in a rough and crude state, merely extracted from its ores and made ready for the use of the blacksmith, the machinist, and the engineer, when we remember that human labor multiplies by hundreds and by thousands the value of the raw material, that a bar of iron which costs five dollars will make three thousand dollars' worth of penknife-blades and two hundred and fifty thousand dollars' worth of watch-springs, we begin to understand the importance of the iron-manufacture, as an element of national wealth, independence, and power.
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