. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 38 PHYSIOLOGICAL PHYSICS. [Chap. iv. wire. The ends of the wire are connected to binding screws, to which wires can be connected for leading off the induced currents, for instance to a galvanometer, as shown in the figure, which indicates their existence. The coils are so made that the primary can slip out of or into the interior of the secondary, which is hollow. By such an arrangement all the phenomena described can be readily obse
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 38 PHYSIOLOGICAL PHYSICS. [Chap. iv. wire. The ends of the wire are connected to binding screws, to which wires can be connected for leading off the induced currents, for instance to a galvanometer, as shown in the figure, which indicates their existence. The coils are so made that the primary can slip out of or into the interior of the secondary, which is hollow. By such an arrangement all the phenomena described can be readily observed. Such a coil is called an INDUCTION COIL. Induction toy a magnet.—Not only a current of electricity, but also a magnet, is capable of produc- ing induced currents. Thus, suppose the element of primary coil of Fig. 20 to be removed, and let a magnet (AB, Fig. 21) be substituted for them. If the magnet be held stationary above the secondary coil no current is induced. But as soon as the magnet is thrust into the interior of the coil, or removed from it, induced currents are evident, in opposite direc- tions, which also obey Lenz's law. If the magnet be stationary and the neto-ETectrfc co^ moved, induction currents will also induction. be produced. Thus, if coils be rotated before the poles of a strong magnet, a large number of induced currents can be produced, rapidly following one another. This is the principle made use of in the construction of the magneto-electric machine for medical purposes, and in machines for the production of the electric light. It is found also that if in the interior of the secondary coil a core of soft iron be placed, and if one pole of a strong magnet be then brought into contact with the core, it becomes magnetised ; on removing the magnet the core loses its magnetism, but this magnetisation and demagnetisa- tion of the soft iron core produce induction currents in It is further known (page 53) that a current. Please note that these i
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