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586                      METALLURGY   OF   CAST   IRON.
volatile carbonic acid or carbonic oxide, setting free pure metal. This metal covers the surfaces of the iron intimately, filling the smallest pores, and facilitates the direct and intimate union of the solder with the                (
iron.    The flux that has been added covers the place               '*
of the brazing with a vitreous skin, which prevents the oxidation of the iron and the soldering metal.
" The avenues of utility suggested for the new proc-                ,V
ess are three: First, repairing cast iron; second, putting together large castings (which may be made in sections to facilitate moulding and transportation);                 '
third, brazing cast iron to other metals. In this way cast iron can be used in places where wrought iron or steel is now employed, by making only that part out                 
of the stronger metal which is exposed to special strain. While it is hardly to be expected that all pieces                 j
can be brazed with equal success, it is stated that a gear               ^*
wheel 40 inches in diameter and weighing about 220                J
pounds has been satisfactorily repaired in six places in                 *i
hub, spokes, and crown.    Moreover, bars 4 inches in                 '
diameter which have been thus brazed and then broken                 i
at the same place with a chisel, showed a new line of rupture. It is not known that ' ferroflx ' has yet reached America, but it can be obtained in Germany                 I
from Rodolphe Winnike of Berlin. It is also being introduced to the trade in England from H. Bertram & Co., 28 Queen street, London, E. C., who offer to supply full particulars.''                                                                 il