Sentence Examples


  • In fact the uniformity of brass and bell-metal is only superficial; if we adopt the methods described in the article Metallography, and if, after polishing a plane face on a bit of gun-metal, we etch away the surface layer and examine the new surface with a lens or a microscope, we find a complex pattern of at least two materials.
  • The acid used to etch the surface has darkened the parts richest in copper, while those richest in tin remained white.
  • But if we polish the solid alloys, etch them if necessary, and examine them microscopically, we shall find that alloys on the lead side of the diagram consist of comparatively large crystals of lead embedded in a minute complex, which is due to the simultaneous crystallization of the two metals during the solidification at the eutectic temperature.
  • A standard copper strip was taken, the original formed leg terminals were cut off and the new design chemically etched.
  • June 6th 1944 is a date forever etched into our consciousness.

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