efore proceeding to a detailed description of the system of forging, tempering and annealing, which in 850 feet by 11614 feet, a carbonizing department in the case of the Krupp plate, has no parallel in the whole furnaces, it will be well to state that the open hearth which the face-hardening of… … reduce the per- engraving. Air is centage of carbon admitted by way to that required of the valves, and for the particular passes through
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