. American foundry practice . e ?t-i?f;fi^h^t:%A^!D^.^r:Siitii^. 3ES p m a I I I I I ^Vii*^ii^t:iVi6t^9-i m cri -yyyyyy^^^^^.yyyy^.: ^.^W^yy^ ^^^^^^^^ H W^J>^yyyyyyyy^. 1T2 LOAM MOULDIITG. VENTING LOAM AND DRY SAND MOULDS. Loam or dry sand moulds require that some parts bevented more than others. There are often eastings made inmoulds tliat are never vented in any shape or manner. Thisis no proof that everytliing can be cast in loam or dry sandmoulds without venting. There is not nearly the percentageof venting required for dried moulds as for green. In greensand moulds tl
. American foundry practice . e ?t-i?f;fi^h^t:%A^!D^.^r:Siitii^. 3ES p m a I I I I I ^Vii*^ii^t:iVi6t^9-i m cri -yyyyyy^^^^^.yyyy^.: ^.^W^yy^ ^^^^^^^^ H W^J>^yyyyyyyy^. 1T2 LOAM MOULDIITG. VENTING LOAM AND DRY SAND MOULDS. Loam or dry sand moulds require that some parts bevented more than others. There are often eastings made inmoulds tliat are never vented in any shape or manner. Thisis no proof that everytliing can be cast in loam or dry sandmoulds without venting. There is not nearly the percentageof venting required for dried moulds as for green. In greensand moulds tliere is steam to contend with, which is notfound in tlioroughly dried moulds. A plain dry sand mouldhaving 8 of sand between the pattern and flask would becast with less danger of its scabbing, if not vented, than ifthere was only 2 of sand. A good body of sand in a flaskallows the surface gases (and steam, if any) to have a chanceto confine themselves in the interior body of the sand ; andwhen there are no lioles or openings in the flask, it may re-main there, for tliere is room enough to hold the gases, andtheir pressure will be insufficient to force them through theface of the mo
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