. The London, Edinburgh and Dublin philosophical magazine and journal of science . 81, vol. xi. pp. 14, 122; Nature, 1883. X Pro! O. Lodge, Nature, vol. xxxi. p. 268 (1885). § Elster and Geitel, Wied. Ann. xxxi. p. 126 (1887). || R. Nahrwold, Wied. Ann. xxxi. p. 467 (1887); xxxv. p. 116 (1* Phil. Mag. S. 5. Vol. 48. No. 294. Hov. 1899. 2 L 482 Dr. W. Stewart on the Disintegration of was at least materially favoured by the presence of atmo-spheric air ; he considered that the oxygen of the air wasthe potent agent. The following is a description of some experiments on thedisintegration of platin
. The London, Edinburgh and Dublin philosophical magazine and journal of science . 81, vol. xi. pp. 14, 122; Nature, 1883. X Pro! O. Lodge, Nature, vol. xxxi. p. 268 (1885). § Elster and Geitel, Wied. Ann. xxxi. p. 126 (1887). || R. Nahrwold, Wied. Ann. xxxi. p. 467 (1887); xxxv. p. 116 (1* Phil. Mag. S. 5. Vol. 48. No. 294. Hov. 1899. 2 L 482 Dr. W. Stewart on the Disintegration of was at least materially favoured by the presence of atmo-spheric air ; he considered that the oxygen of the air wasthe potent agent. The following is a description of some experiments on thedisintegration of platinum and palladium wires brought byan electric current to a glowing temperature in air,hydrogen, nitrogen, and oxygen at various temperature of the glowing wire ought to be independentof the nature of the surrounding gas ; to effect this objectthe specific resistance of the wire was kept constant by aproper regulation of the current strength. The wire to be experimented upon was suspended (fig. 1)by short thick platinum hooks soldered to the thick copper Fie. wires CD, EF. A current from a battery B passed throughan adjustable resistance R, a manganin resistance M of 0232ohm, and the experimental wire. The difference of potentialsbetween the ends of the experimental wire, and between theends of the manganin resistance, was measured by the volt-meter V, the resistance of the experimental wire calculated,and the variable resistance R adjusted so as to keep thespecific resistance of the experimental wire constant. Thethickness of the wires was 025 millim., their length about170 millim., and the loss of weight was determined whichthey underwent after two hours glowing. The hydrogenused was prepared from chemically pure zinc and dilute sul-phuric acid. To prepare nitrogen the oxygen was removed Plat/ninn and Palladium Wires at Hujli Temperatures. 483 from atmospheric air by phosphorus, and the remaining gaspassed through a solution of potassium permanganate, ando
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