. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. APPLICATIONS OF THE GRAPHIC METHOD. 175 there be equally exact methods of applying, regulating, and measuring the stimulus that induces the contraction. Fig. 170 gives a representation of the inductorium of Du Bois-Reymond, by which either a single brief stimulation or a. Fig. 170.—Du Bois-Reymond's inductorium (after Rosenthal), i, secondary coil; c, primary coil; b, electro-magnet; ft, armature of hammer ; /, small movable screw. The current from
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. APPLICATIONS OF THE GRAPHIC METHOD. 175 there be equally exact methods of applying, regulating, and measuring the stimulus that induces the contraction. Fig. 170 gives a representation of the inductorium of Du Bois-Reymond, by which either a single brief stimulation or a. Fig. 170.—Du Bois-Reymond's inductorium (after Rosenthal), i, secondary coil; c, primary coil; b, electro-magnet; ft, armature of hammer ; /, small movable screw. The current from battery, ascending metal pillar, passes alonehanuner, and by screw gets into primary coil, thus inducing current in secondary coil. By connection between primary coil and wires around soft iron of 6, iron becomes a magnet, hammer is attracted from screw /, and current thus broken ; but when this occurs, soft iron ceases to be a magnet neces- sarily, and, hammer springing back, the whole course of events is repeated. This may occur several hundred times in a second. The above may be clearer from diagram, Fig- 171. By sliding secondary coil up and down, strength of induced current can be graduated. series of such repeated "with great regularity and frequency may be effected. The apparatus consists essentially of a pri-. 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 Mills, Wesley, 1847-1915. New York, D. Appleton
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