Canadian mining journal January-June 1905 . rushed material. The machine is gear-driven and isIntended to receive the flat spalls or slivers in macadam-making plants,and to reduce the same to cubical product. The special feature again inthis machine is the improvement in the metal used In construction. Therolls are strengthened by the use of cast steel, where hitherto cast ironhas been used, and the side frames are entirely of steel castings. Therolls themselves are provided with renewable shells of Era mangan-ese steel. The illustration shows toothed rolls, for which the Era manganese steel I
Canadian mining journal January-June 1905 . rushed material. The machine is gear-driven and isIntended to receive the flat spalls or slivers in macadam-making plants,and to reduce the same to cubical product. The special feature again inthis machine is the improvement in the metal used In construction. Therolls are strengthened by the use of cast steel, where hitherto cast ironhas been used, and the side frames are entirely of steel castings. Therolls themselves are provided with renewable shells of Era mangan-ese steel. The illustration shows toothed rolls, for which the Era manganese steel Is particularly satisfactory, as this metal enables theteeth to be made longer and of a form more satisfactory for to the introduction of the Era manganese steel, chilled castiron was the only metal sufficiently hard to resist the wear, but, as itlacked toughness, the teeth had to be made either very heavy or veryshort. With Era manganese steel it is possible to adopt longerteeth, and thus give longer life to the roll The other figures represent the reciprocating stone breaker as madeby the Hadfield Company, and which has also been improved by theintroduction of the special metals already spoken of. The body is madeof cast steel, the stiffness being imparted by ribs, as shown in thefigure. The pitman and swinging jaw-stock are also made of caststeel, and, showing a reduction of weight, lessen somewhat the motivepower required. The toothed front of the jaw-face (as shown in thecut) is of Era manganese steel, while the back has V-grooves toreduce the amount of metal required. These grooves are filled with aspecial mixture of hard spelter, the surface being left perfectly true, soas to give a satisfactory contact with the steel, of which the main fremieand jaw-stock are made. Jaw-faces thus made can safely be reduced In?weight to one-quarter of the weight necessary when chilled iron is arrangement also facilitates transport and repair, and decrease
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
