Electro-physiology (1896-98) Electro-physiology . electrophysiolog02bied Year: 1896-98 IX ELECTRICAL EXCITATION OF XERYE 127 the iron ring from the point H between the poles of the magnet, the magnetic force of which is correspondingly diminished. This slow decline in the magnetism corresponds to a magnetic induction current in the coil, which rises the more slowly as the iron ring increases more gradually in thickness, and as the disc is the more slowly rotated. On the other side the part M of the ring induces, under similar conditions, by its sharp edge, an almost instantaneous ascending cu
Electro-physiology (1896-98) Electro-physiology . electrophysiolog02bied Year: 1896-98 IX ELECTRICAL EXCITATION OF XERYE 127 the iron ring from the point H between the poles of the magnet, the magnetic force of which is correspondingly diminished. This slow decline in the magnetism corresponds to a magnetic induction current in the coil, which rises the more slowly as the iron ring increases more gradually in thickness, and as the disc is the more slowly rotated. On the other side the part M of the ring induces, under similar conditions, by its sharp edge, an almost instantaneous ascending current. In the frog-preparation the current from the sharp tooth (like the break shock) is always more effective than that from the obtuse tooth, while this is reversed in the toad, where the slowly ascending current invariably excites more effectually than the sharp rise (Fig. 180). It is a question whether this is due merely to the known FIG. 179.
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