Page:Harper's New Monthly Magazine

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Fig. 1.—Annealed soft-steel wire, magnified 300 fold

Fig. 2.—Structure of copper wire magnified 360 times

Fig 3.—Development of crystals in copper wire

Fig 4.—Copper burst asunder by disease

Fig. 5.—Structure of tool-steel properly hardened

Fig. 6—Structure of tool-steel diseased by overheating

TYPICAL EXAMPLES OF STRUCTURAL CHANGES IN METALS

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