. Electro-physiology. Electrophysiology. FIG. 178.—Toad's gastrocnemius. a, Make induction twitch ; b, break induction twitch. (J. Schott.) the frog; there is hardly any difference in the distance of coil at which the make and break shocks take effect. While the in- directly excited frog's muscle always describes much higher twitches (of medium size) if break shocks are employed, this is not the case with the toad, and the make shocks may even be the more effective (Fig. 178). According to Griitzner (14), single induction shocks of different time-distribution can also be produced as follows. A
. Electro-physiology. Electrophysiology. FIG. 178.—Toad's gastrocnemius. a, Make induction twitch ; b, break induction twitch. (J. Schott.) the frog; there is hardly any difference in the distance of coil at which the make and break shocks take effect. While the in- directly excited frog's muscle always describes much higher twitches (of medium size) if break shocks are employed, this is not the case with the toad, and the make shocks may even be the more effective (Fig. 178). According to Griitzner (14), single induction shocks of different time-distribution can also be produced as follows. A ring of sheet-iron is fastened to a brass disc in the form of Fig. 179. This consists of two parts, M and N, of which the latter (on rotating the disc to the right) rises gradually from its base H upon the brass-plate to its greatest height, while M is cut off in the direction of the radius of the disc. If the ringed iron piece MN is then rotated between the poles of a horse-shoe magnet, surrounded with wire-coils, there will (on turning the disc to the right) be a constantly increasing part of. 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
