Canadian mining journal January-June 1905 . geared to the horizontal bevel-wheel B. Avery long bearing is provided for this shaft, which is lined with anti-friction metal. Those parts of the machine which are subject to abra-sion have renewable liners of Era manganese steel. The inclined?diaphragm and the arms of the spider are also protected by thin castsheets of this metal. Great care has been paid to secure absolute metal-lic contact in respect to the mantle over the cone; the inner surface iscoated with a hard white alloy, which can be made perfectly smoothand regular so as to insure a clo
Canadian mining journal January-June 1905 . geared to the horizontal bevel-wheel B. Avery long bearing is provided for this shaft, which is lined with anti-friction metal. Those parts of the machine which are subject to abra-sion have renewable liners of Era manganese steel. The inclined?diaphragm and the arms of the spider are also protected by thin castsheets of this metal. Great care has been paid to secure absolute metal-lic contact in respect to the mantle over the cone; the inner surface iscoated with a hard white alloy, which can be made perfectly smoothand regular so as to insure a close fit on the head. The Hadfield Company have manufactured ten of these gyroscopicbreakers of the largest size for the Premier (Transvaal) Diamond Mines,Limited. They will be used for breaking the blue ground carrying thediamonds preparatory to its further reduction by large crushing is one of the largest single orders yet placed for crushers, the com-bined capacity of the ten machines being in excess of 1,000 tons per Figure 3 illustrates a type of roll crusher now largely used forbreaking partly crushed 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 heav
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