Metallurgy; an introduction to the study of physical metallurgy . rities make their presence felt to such an extent as torender the surface useless. Li the case of the far less violent processes usually employedfor metallographic purposes the mechanical action of thepolishing disc is only one factor in the process. The other is inall probability to be sought in a species of chemical action dueto the polishing powder, which, there is good reason to believe,penetrates the metal to a slight depth and thus produces a sortof forced solution of the powder in the metal. There areseveral reasons for b
Metallurgy; an introduction to the study of physical metallurgy . rities make their presence felt to such an extent as torender the surface useless. Li the case of the far less violent processes usually employedfor metallographic purposes the mechanical action of thepolishing disc is only one factor in the process. The other is inall probability to be sought in a species of chemical action dueto the polishing powder, which, there is good reason to believe,penetrates the metal to a slight depth and thus produces a sortof forced solution of the powder in the metal. There areseveral reasons for believing that such an action occurs. It isfound that the oharacter of the poHsh obtained varies with thenature of the polishing powder used. Thus the colour ofpohshed silver is distinctly darker when rouge is used thanwhen (white) alumina is employed. The chemical behaviourof pohshed surfaces is also found to vary according to thechemical character of the polishing agent. Still more strikingis the fact that in the case of silver which has been polished PLATE
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
