. Electro-physiology. Electrophysiology. 458 ELECTRO-PHYSIOLOGY CHAT. shooting trigger successively opens three contacts. The first of these (Fig. 280, $,_) opens the circuit of the primary coil of a sliding apparatus, the second, $„, abolishes the shunt to the galvano- meter, which can only then be affected by the current from the organ- preparation; and, finally, the third, , opens the galvanometer circuit again, so that the effect in the galvanometer can only last for the interval between the opening of S2 and that of S3. This interval, in Gotch's first experiments, was 0'02 sec. If $2 i
. Electro-physiology. Electrophysiology. 458 ELECTRO-PHYSIOLOGY CHAT. shooting trigger successively opens three contacts. The first of these (Fig. 280, $,_) opens the circuit of the primary coil of a sliding apparatus, the second, $„, abolishes the shunt to the galvano- meter, which can only then be affected by the current from the organ- preparation; and, finally, the third, , opens the galvanometer circuit again, so that the effect in the galvanometer can only last for the interval between the opening of S2 and that of S3. This interval, in Gotch's first experiments, was 0'02 sec. If $2 is shifted close to Sly so that the shunt to the galvanometer is opened almost simul- taneously with the inducing circuit, the former will exhibit the. FIG. 280. same intensity with both homodromous and heterodromous direc- tion. This result can obviously be referred only to the fact that the galvanometer circuit was closed in Gotch's experiments for a very short time after the moment of stimulation, while in du Bois-Eeymond's method, not merely the exciting current, but also the whole after-current of the preparation, passes through the galvanometer. In the first case, therefore, the homodromous after-current (positive polarisation, in du Bois-Eeymond's sense) can add nothing to the homodromous induction-shock which produces it, since, according to Gotch, it is not developed for 0-05 sec. Gotch subsequently extended his operations (), making the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
