Canadian machinery and metalworking (July-December 1917) . ignifi-cant amount of platinum will go a longway, it being the third most ductile, aswell as malleable, of the metals, but thetotal of all these small sales reveals thefact that the price of the metal has beenforced up to such an extent that its pur-chase for chemical use, except in thesemicroscopic quantities, is indeed at aminimum. Platinum is one of the essentials in themanufacture of sulphuric acid by thecontact process; in the methods of ob-taining nitric acid by the oxidation ofammonia, in the production of explosivesand as a cat
Canadian machinery and metalworking (July-December 1917) . ignifi-cant amount of platinum will go a longway, it being the third most ductile, aswell as malleable, of the metals, but thetotal of all these small sales reveals thefact that the price of the metal has beenforced up to such an extent that its pur-chase for chemical use, except in thesemicroscopic quantities, is indeed at aminimum. Platinum is one of the essentials in themanufacture of sulphuric acid by thecontact process; in the methods of ob-taining nitric acid by the oxidation ofammonia, in the production of explosivesand as a catalyst in many other oper-ations. 70 Volume XVlll. EDITORIAL CORRESPONDENCE Embracing the Further Discussion of Previously Published Articles, Inquiries forGeneral Information, Observations and Suggestions—Your Co-operation is Invited MACHINISTS INSTRUCTIONCOURSE—XXIII. By J. Davies GRINDING is a term that is usedfor many different operations,many different kinds of materialincluding all kinds of metal, glass, rub-ber, wood etc., being ground by emery. No. 1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
