File:A treatise on concrete, plain and reinforced - materials, construction, and design of concrete and reinforced concrete; 2nd ed. (1912) (14597031458).jpg

Identifier: treatiseonconcr00tayl (find matches)
Title: A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed.
Year: 1912 (1910s)
Authors: Taylor, Frederick Winslow, 1856-1915 Feret, R Thompson, Sanford E. (Sanford Eleazer), b. 1867
Subjects: Concrete Reinforced concrete
Publisher: New York : J. Wiley
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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ilized a portion of theexcavation by locating their mixer against a bank and building out overit a covered platform containing the hopper from which the materialscould be dropped directly into the mixer. Stone from the excavation wascrushed and elevated to storage bins, whence it was hauled by carts holdingexactly the quantity required for a batch, and dumped directly into thehopper above the mixer. The sand was measured and wheeled to thehopper in an iron vehicle consisting of a bucket set on two large wheelswhich dumped into the hopper by rotating on its axis. The cement wasemptied on top of the sand. One batch was mixing in the machine whileanother was being emptied into the hopper, and thus twenty batches couldbe handled per hour. The concrete was dumped from the mixer intocarts which conveyed it to the dam. Cambridge Electric Light Station. A portable mixing plant em- *Sixth Annual Report Boston Transit Commission, igcx).fSee Frontispiece.tSee chapter xxiv. A TREATISE ON COXCRETE
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MIXING CONCRETE 271 ployed on the Cambridge (Mass.) Electric Light Station is shown in Fig.93. The special feature of the arrangement is the framework containingthe mixer. This may be taken up by the derrick, which also supplies itwith raw materials, and moved in a few minutes to any other positionwithin derrick swing, so that the concrete can be dropped from the mixerclose to or directly upon the place where it is required. East Boston Tunnel. For measuring materials brought in cars tothe work, the contractors for one of the entrance sections of the East

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