. American foundry practice . The joieces of wood, 1, 2, 3, 4, and 5, that are screwed onthe pattern to hold the parts together, are unscrewedand taken off. The three-winged cast-iron cross, shown atX, has three chains hooked in the staples, there being twocast in each wing, so as to give a better chance to regulatethe lifting off. In the cut there is only one half ringshown. When the outside parts of the mould are ready tobe separated, the lifting irons or bolts are hitched in the threering handles, B, B, B. Half of the mould is then hoisteda little, and should it not hang just right, lower i
. American foundry practice . The joieces of wood, 1, 2, 3, 4, and 5, that are screwed onthe pattern to hold the parts together, are unscrewedand taken off. The three-winged cast-iron cross, shown atX, has three chains hooked in the staples, there being twocast in each wing, so as to give a better chance to regulatethe lifting off. In the cut there is only one half ringshown. When the outside parts of the mould are ready tobe separated, the lifting irons or bolts are hitched in the threering handles, B, B, B. Half of the mould is then hoisteda little, and should it not hang just right, lower it down andadjust the stirrups till it hoists level.* The half mould, when hoisted off, is pushed around to theoven carriage and lowered on it, which operation is repeatedwith the other half. The patterns are now drawn, and themoulds finished and run into the oven to dry. The two * An excellent chapter uj)on the principle of balancing andhoisting moulds is seen on p. 435, Vol. II. MOULDING LARGE QUARTER-TURX PIPES IX LOAM. 147. MOULDING QUARTER-TURN PIPES. 148 LOAM MOULDIKG. half patterns are now set back in their original places, andpieces are screwed to the outside to hold the two partstogether. The core is now made, and with a four-wingedcross hitched to the four handles, /S, S, S, S, the bottomjilate and core are also hoisted on an oven carriage. Theimttern is drawn, and the core finislicd and run into theoven to dry. While tlicse are drying, a top ring (notshown) is made to cover the top flange with. When all the moulds are dry, the bottom and coreare hoisted off first and set level wliere wanted. The out-side halves are then placed on the bottom in their place, andthe top covering ring set on. The wliole mould is nowready to be bolted together, wliich is done by boltingthe top covering ring down to the bottom plate, the handlebeing used to bolt the two together. The mould is notsunk in the floor or pit, but is set up on the shop floor andthe sand rammed up around it, a sta
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