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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
