. Elements of human physiology. Physiology. APPENDIX 701 shock of high mtensity and short duration caused by the sharp break of the primary current. When ^Ye desire to use faradic stimulation—that is, secondary induced shocks rapidly repeated 50 to 100 times a second—we make use of the apparatus attached to the coil, known as Wagner's hammer (Figs. 316 and 318). In this case the wires from the battery are connected to the two lower screws (a and b. Fig. 316). Fig. 318 shows the direction of the current when Wagner's hammer is used. The current enters at (a), runs up the pillar and along the sp
. Elements of human physiology. Physiology. APPENDIX 701 shock of high mtensity and short duration caused by the sharp break of the primary current. When ^Ye desire to use faradic stimulation—that is, secondary induced shocks rapidly repeated 50 to 100 times a second—we make use of the apparatus attached to the coil, known as Wagner's hammer (Figs. 316 and 318). In this case the wires from the battery are connected to the two lower screws (a and b. Fig. 316). Fig. 318 shows the direction of the current when Wagner's hammer is used. The current enters at (a), runs up the pillar and along the spring to the screw (x). Here it passes up through the screw, and through the primary coil (e,). From the primary coil it passes up the small coil (m), and from this to the Fig. Diagram showing course of current in inductorium when Wagner's hammer is used. terminal (b) and back to the battery. But in this course the coil (m) is converted into an electro-magnet. The hammer (h) attached to the spring is attracted down, and so the spring is drawn away from the screw (x), and the current is therefore broken. The break of the current destroys the magnetic power of the coil, the spring jumps up again and once more makes circuit with the screw (x), only to be drawn down again directly this occurs. In this way the sprmg is kept vibrating, and the primary circuit is continually made and broken, with the production at each make-and-break of an induced current in the secondary coil. It is evident that, when the primary current is made and broken fifty times in the second, there will be a hundred momentary currents produced during the same period in 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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