. Public works . strike with heavy, rapid blowsso that the entire space is covered bythe four tampers as they travel aroundthe forming pipe, two close to the coreand two next to the jacket. By meansof moving tables the pipe is taken offthe machine and then taken away bymeans of special carts. Some of the principal advantagesclaimed for this machine are that thecore which does the troweling rotatesindependently of the other parts of themechanism and can be operated indefi-nitely and instead of being drawn up-ward, tending to disturb the composi- strike powerfulblows and pro-duce uniform den-sit
. Public works . strike with heavy, rapid blowsso that the entire space is covered bythe four tampers as they travel aroundthe forming pipe, two close to the coreand two next to the jacket. By meansof moving tables the pipe is taken offthe machine and then taken away bymeans of special carts. Some of the principal advantagesclaimed for this machine are that thecore which does the troweling rotatesindependently of the other parts of themechanism and can be operated indefi-nitely and instead of being drawn up-ward, tending to disturb the composi- strike powerfulblows and pro-duce uniform den-sity from one endaf the pipe to theother. By the At-las process it isclaimed to bepossible to makepipes of extreme-Iv wet mixture sothat the troweledinterior is imper-meable andsmooth. In oper-ation the tubeabove the mold i?given a verticalreciprocating mo-tion; at the sametime the tube iscaused to revolve around the wall of the pipe. The feedhopper delivers the mixed concrete intothe funnel passing through the tube. FROM SEWER XT W.^VUSATJ, WIS. tion, the core is drawn machine is easily manipulated byfour levers conveniently located. No
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
