. American foundry practice . • ..... ?i;^;,>« • •• •JiG DEVICE FOE MOULDING PULLEYS. 56 GKEEN SAKB MOULDING. YENTING GREEN SAND MOULDS. Veisttikg a mould with a vent wire is done to allow the freeescape of air and gases in the sand, together with the steamgenerated by the liquid iron coming into contact with dampsand. New sand will not stand ramming as hard, and needsmore venting than old sand, by reason of the additionallife and gases in it. Sand mixed with sea coal or mineralsneeds still more venting because of the increased it not to provide for the escape of these gases, air
. American foundry practice . • ..... ?i;^;,>« • •• •JiG DEVICE FOE MOULDING PULLEYS. 56 GKEEN SAKB MOULDING. YENTING GREEN SAND MOULDS. Veisttikg a mould with a vent wire is done to allow the freeescape of air and gases in the sand, together with the steamgenerated by the liquid iron coming into contact with dampsand. New sand will not stand ramming as hard, and needsmore venting than old sand, by reason of the additionallife and gases in it. Sand mixed with sea coal or mineralsneeds still more venting because of the increased it not to provide for the escape of these gases, air, andsteam, moulds could be rammed as hard as iron, and haveno blowing or scabs. The bottom of moulds often requiresthe most venting, because it is the part which takes thelongest time to be covered with a body of iron, and whencovered, is surrounded mostly by the iron. Plain copes are vented more to allow for the easy escape ofthe air confined in the mould, than for the escape of gasesor steam in the cope sand.
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