Metallurgy; an introduction to the study of physical metallurgy . er cent, solution of sulphuricacid in water and the steel is thus exposed to the action of thedilute acid held in the damp paper. Under the action of thisacid every particle of sulphide which is exposed in the surfaceof the steel is attacked and minute streams of hydrogensulphide issue from every such particle. The hydrogen sulphidethus evolved acts upon the silver bromide, producing a darkspeck of silver sulphide opposite every particle of sulphidepresent in the steel surface, and a direct contact print, generallyknown as a sul
Metallurgy; an introduction to the study of physical metallurgy . er cent, solution of sulphuricacid in water and the steel is thus exposed to the action of thedilute acid held in the damp paper. Under the action of thisacid every particle of sulphide which is exposed in the surfaceof the steel is attacked and minute streams of hydrogensulphide issue from every such particle. The hydrogen sulphidethus evolved acts upon the silver bromide, producing a darkspeck of silver sulphide opposite every particle of sulphidepresent in the steel surface, and a direct contact print, generallyknown as a sulphur print is thus obtained which clearlyindicates the distribution of sulphur in the steel. Since thevarious impurities of steel generally segregate more or lesstogether, the appearance of a sulphur print serves aa a guideto the presence or absence of general segregation in the steelas well as to the distribution of sulphur itself. In non-ferrous metals the conditions with regard to suspendedimpurities are somewhat different. Alloys such as brass or PLATE f-vf5^-^, Fig. 135.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
