GERMAN a.
copper slag at Henneberg. A small amount of iron is sometimes added to make it whiter and harder. It is essentially identical with the Chinese alloy packfong. It was formerly much used for tableware, knife handles, frames, cases, bearings of machinery, etc., but is now largely superseded by other white alloys. -- Germ…
IRIDIUM n.
element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.5.