ZINC

was | originally used for.. little else than making bra (an alloy of copper and zinc), and though the ore was used with copper by the Romans under the form of calamine, the metal was not differentiated till the time of Para cels us. Early in the present century it was discovered that zinc could be made quite fit for manipulation by machinery, simply by being heated to a temperature of about 300° F.; and since then the metal has been used by itself, as well as in alloys, for all sorts of purposes— roofing, baths, statuettes of ‘ imitation bronze,’ etc.; but its use in —i.e. all these connections is mainly as a 4 cover ’ for iron