Canadian mining journal January-June 1905 . -structing stone and ore-crushing machinery, and has enlarged its worksfor this purpose. The result has been not alone the improvement of de-tails in the design of various types of crushing machines, but also in theapplication of alloys and metals which have not hitherto been research work of the managing director of the company, Mr. R. , and his modifications of different processes, has resulted Incast steel being now very extensively employed in places where formerlycast iron was used. The saving is not alone in weight, but a
Canadian mining journal January-June 1905 . -structing stone and ore-crushing machinery, and has enlarged its worksfor this purpose. The result has been not alone the improvement of de-tails in the design of various types of crushing machines, but also in theapplication of alloys and metals which have not hitherto been research work of the managing director of the company, Mr. R. , and his modifications of different processes, has resulted Incast steel being now very extensively employed in places where formerlycast iron was used. The saving is not alone in weight, but also in thegreatly Increased strength of the parts. The particular brand of man-ganese steel known as the Era, introduced by Mr. Hadfield In otherconnections, has been utilized for liners, jaw-faces, ahd teeth for crush-ing-rolls. The consequent reduction in weight is important, as a crush-ing plant is always required to be of a portable nature, and in any casehas frequently to be sent to countries where railway facilities arelimited. ; : ;. We publish an illustration of the Hadfield and Jack patent Heclon gyratory breaker, in the design of which there are several importantdepartures. In all other machines of this type the crushing-head, orcone, is fixed on a solid shaft, and the downward thrust is taken at thelower end of the shaft. This is objectionable, because the shaft is sup-ported where the motion is the greatest, and there is set up a frictlonalresistance which develops considerable heat, and this interferes withsmoothness of working, and adds to the power which is necessary fordriving, Usually the conditions are such that dust finds its way Intothe eccentric. In the Hadfield patent the central shaft is hollow, and Itsbearing is at the upper end, where motion Is practically nothing; thefact that the hollow shaft fits over the outside of the eccentric resultsIn all dust and dirt being effectually excluded. It Is also hardly neces-eary to point out that, with the hollow sh
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
