. The cold- and less valuable irons this mottling of shortness attributable to too large a the surface is comparatively heavy and quantity of phosphorus is not indicated uneven and the want of homogeneity in by any exterior appearance of the bar, the structure of the metal is clearly indi- whereas,… … Fig. 28. Fig. 27. present a far greater variety than those overheating, by which the more fusible of iron specimens, in fact there are at parts of the bar were actually melted. least a dozen or fifteen different appear- The length or size of the fibers in the ances in steel indicating corresponding…
Engineering
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