A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . r than machines, properlyso-called, require no power,the materials being mixed bystriking obstructions whichthrow them together in theirdescent through the gravity concrete mixer is il-lustrated in Gillmores Treat-ise on Limes, Hydraulic Ce-ments and Mortars,* firstpubUshed in 1863. In thismachine the concrete fell intosuccessive hoppers opened andclosed by hand-levers. A well-known modern typeof the gravity machine, shownin Fig. 87,
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . r than machines, properlyso-called, require no power,the materials being mixed bystriking obstructions whichthrow them together in theirdescent through the gravity concrete mixer is il-lustrated in Gillmores Treat-ise on Limes, Hydraulic Ce-ments and Mortars,* firstpubUshed in 1863. In thismachine the concrete fell intosuccessive hoppers opened andclosed by hand-levers. A well-known modern typeof the gravity machine, shownin Fig. 87, may be increasedin length from 4 to 10 feetby adding different falling through the slant-ing tube the materials arethrown by the deflectors onthe sides and the curvedback — the deflectors alsoacting as tables upon whichFig. 87.—Gravity Mixers. {See p. 26^.) the stones are coated withmortar—against several series of iron rods which mix them violentlytogether. The inventor claims that by this violence the cement is poundedinto the fractures and indentations of the sand and stone so as to increase *Page MIXING CONCRETE 263 the strength of the concrete produced. The materials generally aremeasured in layers on a platform above the machine and fed by shovels,but may be fed by a tipping box or by a derrick bucket. In the lattercase the mixer becomes practically a batch machine. Another gravity mixer is illustrated in Fig. 88. Four cone-shaped 3 STORAGE BrNS EACH 4 FT. X 13 FT.
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