Calendar: 1881-1882 Page 674

APPLIED SCIENCES 675 XL-iMetallurgi Explain the relative advantages and disadvantages attending the use of charcoal coal and coke in the various stages of the manufacture of iron by the best known processes Enumerate the most important iron ores and the locali- ties in which they are principally found describe their principal characteristics and the general principle involved in their reduction to the metallic state What effect would silicon sulphur carbon phosphorus manganese and copper have individually and collectively on the physical properties of steel made by the Bessemer or Siemens processes Why does practically the whole of the phosphorus present in the ore pass into the pig-iron in the blast furnace And by what means is it removed during the conversion of the pig-iron into steel by the Thomas and Gilchrist process Explain the principle of the Welsh process for the ex- traction of copper from its ores At what stages of the process and by what means are the various impurities which commonly accompany the ores removed Give the composition of the most important alloys of copper and mention their chief uses Does copper expand or contract on sob'difying Give approximately its linear dilatation by heat for To what properties do platinum and bismuth respectively owe their special value What is the composition of type metal Explain the purpose which each of its constituents fulfils 10 Name the specimens on the table and state the characteristics by which you recognise each υ υ