...the great heat to which it is exposed. Pieces of copper are sometimes externally converted into brs» by exposure when at a red heat to the vapour of zinc : in this are prepared the copper bars from which the so-called gold of Lyons is manufactured. Copper...

...colour, and poisonous. It is used in medicine and painting. Brass consists of about 30 parts ofzinc'and 70 of copper. Copper is sometimes externally converted...consists of 91 parts of copper, 2 of tin, 6 of zinc, and I of lead. The brass of the ancients was copper and tin. LEAD. SymboJ, Pb ; Equivalent, loj. Lead is...

...zinc, separately melted in different crucibles, and afterwards mixed and incorporated by stirring. Copper is sometimes externally converted into brass...exposure, when at a red heat, to the vapour of zinc ; in this way are prepared the copper bars from which the so-called " gold wire " of Lyons is manufactured....