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 329
Fig. 508. Cope Lifted Off. Fig. 509. Drawing Pattern- Rapping. pins are used that openings may be formed thru the copeinto the drag thru which the metal may be poured. (9)Sand is riddled over pattern and parting after which thecope is filled full of sand and tamped and vented. Fig. 507.(10) The… … Fig. 510. Cutting Gates. Fig. 511. Ready for Pouring. rapped, forced slightly in horizontal directions to releasethe sand from ])atterns sides, and then drawn ; gates arecut and cores are set if there are any, Figs. 509 and 510. PATTERN MAKING. 325 Gates are the sluiceways or channels thru which…
Woodwork (Manual training)
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