Metallurgy; an introduction to the study of physical metallurgy . hstrike the flat surfaces betweenthe crystals are reflected backdirectly into the objective, andthese surfaces consequently ap-pear bright; those rays, how-ever, which strike the slopingsurface of the step—the sHpband —^will be reflected awayfrom the microscope, and thesteps will, therefore, send no light into the objective, and willappear black in the field of view. The optical characteristics just described afford a verystriking demonstration of the fact that slip bands reallyare of the nature of steps, as indicated in the dia
Metallurgy; an introduction to the study of physical metallurgy . hstrike the flat surfaces betweenthe crystals are reflected backdirectly into the objective, andthese surfaces consequently ap-pear bright; those rays, how-ever, which strike the slopingsurface of the step—the sHpband —^will be reflected awayfrom the microscope, and thesteps will, therefore, send no light into the objective, and willappear black in the field of view. The optical characteristics just described afford a verystriking demonstration of the fact that slip bands reallyare of the nature of steps, as indicated in the diagram of Fig. rays of light falling normally on these bands are reflectedoutwards, conversely, rays falling obliquely on to such slopingsurfaces will, if the angle of incidence be properly adjusted, bereflected into the lens of the microscope ; at the same time,?obhque rays f alHng on the smooth flat areas between the stepswill pass outside the microscope objective. When, therefore,.& crystal on whose surface slip-bands have been developed is. Fig. 103.—Diagram illustratingthe Optical behaviour ofSlip Bauds. PLATE XXII.
Size: 1474px × 1696px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
