Elements of chemistry : including the applications of the science in the arts . de. Thegases in the tubes are supplementary, and do noUake apart in the polar chain. The modifications of this bat-tery, where, instead of hydrogen gas, sulphur or phos-phorus, vaporized in nitrogen gas, or a gaseous hydro-carbon, is placed at the positive pole, are of the samecharacter, and only act by supplying a film of an oxida-ble body, such as sulphur, or phosphorus, to the surfaceof the platinum, capable of forming the positive elementof a polar molecule with that metal. This, again, mustbe covered by the bi
Elements of chemistry : including the applications of the science in the arts . de. Thegases in the tubes are supplementary, and do noUake apart in the polar chain. The modifications of this bat-tery, where, instead of hydrogen gas, sulphur or phos-phorus, vaporized in nitrogen gas, or a gaseous hydro-carbon, is placed at the positive pole, are of the samecharacter, and only act by supplying a film of an oxida-ble body, such as sulphur, or phosphorus, to the surfaceof the platinum, capable of forming the positive elementof a polar molecule with that metal. This, again, mustbe covered by the binary acid fluid, in order to commu-nicate by a polar chain with the oxygen of the terminalmolecule of platinum and oxygen in the negativechamber of the divided cell. (Grove, on the GasVoltaic Battery : Philosophical Transactions, 184d and 5 Closely resembling these circles is that in which one of the platinum plates iscovered by a film of peroxide of lead or peroxide of manganese. The platinumplate may be so prepared by making it the negative terminal for a short time in a14. 210 CHEMICAL POLARITY. solution of acetate of lead or of protosulphate of manganese. In an acid fluid,which is capable of dissolving the protoxide of lead or manganese, polarization occurs, the excess of oxygen of the attached peroxide forming with platinum a polarmolecule, in which the oxygen is the chlorous element. This decomposes the salinemolecule of the acid, or water, causing the transference of the salt-radical or oxygento the clean platinum plate, where it may be evolved as gas. This most nearly re-sembles the case with chlorine — water at one platinum plate, which causes theevolution of oxygen at the other platinum plate j the only source of polarizing powerin the circle being a chlorous affinity. 6. By much the most powerful voltaic arrangement of this class is that in whichone chamber of the divided cell is charged with a solution of sulphide of potassium,and the other chamber with strong nit
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