A Practical Treatise On Natural And Artificial Concrete Its Varieties And Const
A Practical Treatise On Natural And Artificial Concrete Its Varieties And Const
Henry Reid
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Two horizontal shafts passing under the table have a series of cams or eccentrics, which, in their rotation, alter- nately raise and lower the mould, imparting thereby a 252 A PRACTICAL TREATISE ON CONCRETE. trembling motion, by which the concrete paste in the frame is gradually and effectually consolidated. Fig. 38 shows the plan of the shaft arrangement, the cams, and driving gear. Fig. 39 represents an end view of the framework and FIG. 39. driving machinery. This machine is very simple in c...ha- racter, and produces slabs of great density, in the production of which a minimum amount of water is used. The movable slab mould, when sufficiently filled, has its upper surface trowelled off by hand, and is then taken away to a stack, where it is piled until sufficiently dried for the silicating tank. The foundations on which the machinery rests require to be substantial to resist the damaging vibratory action, which is necessarily rapid and frequent so as to secure the best results from such a system of impact, for by that name may its force be designated.
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