The Practical mechanic's journal . able pieces, as seen at//. Counterparts of these side pieces are formedon the pattern chair, as seen in the plan, fig. 2, which produce openingsin the matrix of the size required. The side pieces being cast separately,are afterwards fitted in their position by an angular joint. This modealso admits of the casting of the pouring-gate, m, separately, this beingattached to one of the side pieces. Fig. l-8th The facility of casting, which this process provides, is very consider-able ; and if the difficulties occasioned by the expansion of the matricesfrom the
The Practical mechanic's journal . able pieces, as seen at//. Counterparts of these side pieces are formedon the pattern chair, as seen in the plan, fig. 2, which produce openingsin the matrix of the size required. The side pieces being cast separately,are afterwards fitted in their position by an angular joint. This modealso admits of the casting of the pouring-gate, m, separately, this beingattached to one of the side pieces. Fig. l-8th The facility of casting, which this process provides, is very consider-able ; and if the difficulties occasioned by the expansion of the matricesfrom the heat of the melted iron can be overcome, it will be only fair tosurmise that it will be largely adopted. As a further means of facilitating the casting of chairs, the inventorproposes to employ a circular ring, or table, movable in a circular direc-tion, upon pulleys, carried by a set of standards attached to the floor ofthe moulding-shop. The moulds, with their turn-over plates, are arrangedupon this ring; and as each mould is ready for receiving the metal, thering is moved round until the mould to be filled arrives beneath a sta-tionary metal ladle, which is suspended from above. To improve the strength of the chairs, he proposes to remove them asearly as possible from their moulds, and deposit them in annealing kilnsor furnaces, or in a sand bath. The last head of the invention relates tothe casting of chairs of metal taken
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Keywords: ., bookcentury1800, bookdecade1840, bookidpra, booksubjecttechnology
