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Vertical section of a double-hammer column
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Description: "A vertical section through the valve casing of a double-column hammer, used for heavy forge work."—Finley, 1917
Source: Finley, John H. Nelson's Perpetual Loose-Leaf Encyclopedia (New York City: Thomas Nelson and Sons, 1917) 11:417
Keywords: vertical, double, column, hammer, forge, machine, industry, steam
Copyright: 2009, Florida Center for Instructional Technology. See license.
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