Metallurgy; an introduction to the study of physical metallurgy . being very clearly etching figures can also be developed in iron by theuse of suitable reagents (especially copper-ammonium chloridesolution). Sometimes, however, the crystalline character ofthese grains can be revealed without the aid of any etchingreagents ; when molten cadmium, for example, is allowed tosolidify in contact with the warmed surface of a piece of glassor of mica, a smooth, bright surface suitable for microscopicexamination is sometimes obtained, but at other times thesolidifying metal is found to h
Metallurgy; an introduction to the study of physical metallurgy . being very clearly etching figures can also be developed in iron by theuse of suitable reagents (especially copper-ammonium chloridesolution). Sometimes, however, the crystalline character ofthese grains can be revealed without the aid of any etchingreagents ; when molten cadmium, for example, is allowed tosolidify in contact with the warmed surface of a piece of glassor of mica, a smooth, bright surface suitable for microscopicexamination is sometimes obtained, but at other times thesolidifying metal is found to have imprisoned smaU bubbles ofair or of steam, and the crystals of the metal then build them-selves up around these bubbles of gas. In these circumstancesit is sometimes found that a number of such minute bubbleshave been enclosed within a gyagle crystal, and that each ofthese has assumed an accurate geometrical shape—a shapewhich is similar and similarly situated within each crystal, butwhich differs in shape and orientation from one crystal to the PLATE Fig. 17.
Size: 1835px × 1361px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
