Electro-physiology (1896-98) Electro-physiology electrophysiolog02bied Year: 1896-98 300 ELECTRO-PHYSIOLOGY CHAP augmented resistance. But if polarisation occurs at the point at which the lines of current pass from the fluid into the metal, and if there is in consequence such a marked ' resistance' that the resistance due to unequal length of the lines of current is practically out of consideration, there is evidently nothing to prevent a wider diffusion of the current in the moist sheath along the core (Hermann). As is obvious from the accompanying schema, a branch current must flow in every
Electro-physiology (1896-98) Electro-physiology electrophysiolog02bied Year: 1896-98 300 ELECTRO-PHYSIOLOGY CHAP augmented resistance. But if polarisation occurs at the point at which the lines of current pass from the fluid into the metal, and if there is in consequence such a marked ' resistance' that the resistance due to unequal length of the lines of current is practically out of consideration, there is evidently nothing to prevent a wider diffusion of the current in the moist sheath along the core (Hermann). As is obvious from the accompanying schema, a branch current must flow in every extrapolar leacling-off circuit, at what- ever point it is applied, in the direction of the polarising current (Fig. 214). The following observations of Hermann (39, v. p. A 270) point to the same result. ' In Fig. 215 the lines Ah and Cg show the path that would inevitably be taken by the current if there were no polarisation, in view of the thinness of the moist sheath and good conductivity of the metal core, in order to pass from the electrode points A and C to the core. If polarisa- tion occurs at h and g, the metal ( platinum in dilute sulphuric acid) would be charged with hydrogen at h, with oxygen at g. The platinum point h, which is charged with hydrogen, would then be electrically active towards the uncharged points near it h-Ji^, and currents would be generated in the moist sheath in the direction shown in the figure. These currents give off hydrogen at h-Ji^ oxygen at h, but in a quantity insufficient to neutralise the fresh hydrogen which is constantly being deposited by the current. The charged points 7^ are now electromotive to their uncharged neighbours /to, fresh currents /t^t., arise which
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