Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 452
THREE-HIGH ROLLING-MILL. … FIG. 14. REVOLVING TYPE OF OPEN-HEARTH FURNACE. crucibles (amounting to only a few poundseach) are emptied into a ladle, from which thesteel is poured into sand molds to make cruci-ble steel castings. These castings are of a high grade, quite strong, and not at all like the brittle castings made…
Children's literature
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