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
ove the sand about the pattern, until thepattern can be withdrawn without breaking the mold.The molder will now place that part which is to berammed up in the cope, Fig. 504. After the parting has 324 WOODWORK FOR SECONDARY SCHOOLS. been properly prepared, parting sand, dry sea sand orrattler sand,… … 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…
Woodwork (Manual training)
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