McCracken, Edward M, Sampson, Charles Henry, 1883- · New York : D. Van Nostrand Company · leaf 31
foundry practice. surface on the casting, also to protect the fusible elements in Molding— In producing a mold of sand in which metal is the sand from the intense heat of the molten metal. On green to be cast, a pattern of the casting is usually employed to form sand molds it may be applied as a… … sand) and a small percentage of alumina (clay). These ele- Fig. 63. ments are essential, as the sand must be capable of resisting the Facing Sand— The mixture of sand applied directly against heat of the metal and sufficiently porous to afford a free escape the pattern. This mixture differs…
Patternmaking
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