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Stone-pipe ma-chine′.

Fig. 5869 illustrates a stone-pipe machine. It has a rotarymixer A and tamping-machine B employed in making artificial stone pipe. The cement and sand are incorporated together in the former and transferred to a two-part circular mold, having a core, at the lower part of the latter. As each layer of the mixture is placed in the latter, it is competed by blows from a rammer carried by an arm on a vertical rod, which has a rotary motion and is gradually lifted as the formation of the pipe progresses.

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