Electrochemical and metallurgical industry . for cyanide; the electrolyticchlorination process, though roasting, had failed to extract thegold from ore which was a simple tel-luride. He then contradicts the viewthat neither the acid nor the bleach hasany indispensable efficacy in the chlor-ination process, other than to deliver chlorine; he thinks thatthis view overlooks the difference between molecular andnascent chlorine. Osone.—To the London Elec. Review, of December 30, J. Kershaw contributes another article f)!i the production andutilization of ozone. He first describes a
Electrochemical and metallurgical industry . for cyanide; the electrolyticchlorination process, though roasting, had failed to extract thegold from ore which was a simple tel-luride. He then contradicts the viewthat neither the acid nor the bleach hasany indispensable efficacy in the chlor-ination process, other than to deliver chlorine; he thinks thatthis view overlooks the difference between molecular andnascent chlorine. Osone.—To the London Elec. Review, of December 30, J. Kershaw contributes another article f)!i the production andutilization of ozone. He first describes a modified form of theBerthelot tube ozonizer, now being employed by Bone andDrugman in research work at the Victoria University in Man-chester. This consists of a U-tube formed of two thin walledglass tubes, one inside the other, their surfaces nearly touch-ing, and sealed together at /, as shown in Fig. 4. The outer U-tube has branches at A and B, for the inlet of air, and exit ofthe ozonized product. The conducting medium is a slightly. FIG. 4. OZONIZER. 1 8o KLECTKOCHKMICAI. WD MKTALLURGICAL IXDISIUN. |Voi. 111. No. 2. acid solution of copper sulphate, the inner tubes, C and P, andthe outer thick glass containing vessel II heinR nearly filled withthis sohition. A stout copper wire passes down each of thesetubes, and these wires are connected to the positive and nega-tive poles of the induction coil or transformer supplying thecurrent The air passes along the very narrow annular spacel»etween the inner and outer tubes. The advantages of a liquidcontact in place of metal are. that there is a more regular andsilent discharge of the electric current in the space betweenthe two glass tubes, and that the temjierature of the apparatuscan more easily be kept under control, a flow of the sulphatesohition through the inner and outer tubes being very simpleto arrange, if desired. Any number of single ozoni/er tubescan also be grouped together, and for experimental work thisform of o
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