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 341
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 used whereverpossible because of economy of time inmaking. Quite often whole molds are ^a^-: w Fig. 533. VerticalGreen-Sand… … Fig. 534. Vertical Dry-Sand Cores. HOfllZONTAL DRY-5AND COR-E cores made in dry sand known as vertical, Figs. 533 and534, horizontal, Fig. 535, jacket and chest cores. Core-prints are the projecting pieces on a pattern. Fig.512, which serve no other purpose than to make or formimpressions in the…
Woodwork (Manual training)
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