. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . nvil and its foundation, so as tomitigate the violence of the shock. Pattersons Elephantstamper and Sholls pneumatic stamps get over thisdifficulty, through the means which we have described andillustrated. FouKTH Division. Abraders or Triturators, Millstones, and the ordinary Grinding Machines. Mottes Patent Univeesal Crushing Machine. This machine is of a somewhat novel construction, itsaction and influence being modelled on the principle ofthe pestle and mortar, in fact the Mortarium of t
. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . nvil and its foundation, so as tomitigate the violence of the shock. Pattersons Elephantstamper and Sholls pneumatic stamps get over thisdifficulty, through the means which we have described andillustrated. FouKTH Division. Abraders or Triturators, Millstones, and the ordinary Grinding Machines. Mottes Patent Univeesal Crushing Machine. This machine is of a somewhat novel construction, itsaction and influence being modelled on the principle ofthe pestle and mortar, in fact the Mortarium of theEomans. The members of the machine are few and simplein character, and the motion being rotary, secures an evenwear of the working surfaces. A reference to Fig. 17 willshow the mode by which the materials to be ground aretreated. They are put into the machine at the opening 144 A PRACTICAL TREATISE ON CONCRETE. where the indicating arrow denotes the points where theyfirst become subjected to the grinding action of the revolvingpestle, and are gradually reduced in their descending course, Fig. Mottes Patent Universal Crushing Machine. where they issue in the direction of the outflowing arrows,as shown at the base of the machine. The lever to regulatethe quality or fineness of output is on the principle usually MACHINERY FOR REDUCING THE AGGREGATES. 145 applied to control the produce from horizontal grinding mills,and is guided by the vertical spindle working in a wheelscrew at the top, as delineated iu the illustration. There can be no question of the simple character ofthis machine, and from the experience obtained during itsuse in Belgium it may be considered as a most usefulone. At Liege, where it has been employed for some timein the reduction of limestone for road-making purposes, itbreaks 300 tons into the desired size for Macadam in tenworking hours. Another mill of the same (largest) size,working at Charleroi, broke or reduced 150 tons of hardQuanest porphyry for
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1879
