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Secondary Crusher,Secondary Crushing PlantThe use of large primary crusher made secondary crusher plant necessary, but this department was taken care of nicely by the existing lines of standard clay secondary crusher. In commercial stone crushing plant, there was gradual increasing the number of products, but generally a sufficient demand existed for the coarser grades for ballasts and macadam roads to absorb the output. So for a time everything went along quite comfortably in this respect, and the operator concerned himself with the problem of getting out increased tonnage, selling his product as it was made, or stocking it during off-seasons for any particular grades. Then came reinforced concrete, and with it a rapidly increasing demand for small sizes of secondary crushing stone and gravel. It is hard to say when this deman began to assume sizable proportions, but shortly after 1910 commercial plants began to feel the effects of it, and to look for a remedy. For some time, as was quite logical, the remedy consisted of installing more small secondary crusher, generally small gyratoryes. This procedure assumed rather startling proportions in some large plants. For example, the array of stone crushing plant of the Brownell Improvement Co., Thornton. Ell. (built in 1913) comprised one 48-in. primary, four N°. 7 ½ secondaries and a battery of fine crusher that included four N°. 6 and twelve N°. 4 All were gyratories, although later, two sets of crushing rolls were added to augment the production small stone.
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