Woodwork for secondary schools; a text-book for high schools and colleges, prevocational and elementary industrial schools (1916)
Griffith, Ira Samuel, 1874-1924 · Peoria, Ill., Manual Arts Press · leaf 340
Fig. 531. Pattern and Casting of Pipe. to the corner or shoulder instead of g-lue. 278. Cores; Core-Prints; Core-Boxes.—When, in … Fig. 532. Vertical Green-Sand Core. l^ijiljiH^iiin^if : .. fiiTni^^iytj^ foundry molding-, it is desired to form a casting w^ith ahollow, or hollows therein, internalmolds or cores must be used, Fig. 531.While many cores are made from greensand, most cores are made of dry sand.Green-sand cores are…
Woodwork (Manual training)
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