. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. INDUCTION. 35 Let E (Fig. 19) be an element from the positive pole of which the wire A passes to a cup containing mercury, into which it dips at B. Let c be the wire from the negative pole also dipping into the mercury. Let FD be another wire running parallel to AB, and in its neighbourhood, and let the ends of FD be connected with a galvanometer, an instrument for indicating the presence of currents of electricity by the
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. INDUCTION. 35 Let E (Fig. 19) be an element from the positive pole of which the wire A passes to a cup containing mercury, into which it dips at B. Let c be the wire from the negative pole also dipping into the mercury. Let FD be another wire running parallel to AB, and in its neighbourhood, and let the ends of FD be connected with a galvanometer, an instrument for indicating the presence of currents of electricity by the movement of a magnetic needle. It is fully described in chapter x. We have thus two circuits, the one in connection with the cell, which may be called the cell or battery circuit, or better, the PRIMARY CIRCUIT ; the other, in connection with the galvanometer, is the T ., Fig. of lu- galvanometer circuit, or SECON- duction. DARY CIRCUIT. When one of the wires coming from E is withdrawn from the mercury cup the circuit of the cell is opened, and the electricity ceases to flow. When the wire is re-immersed in the mercury the circuit is closed, and the current is re-established. 1. Now supposing the battery circuit to be open, let it be closed by dipping the wire into the mercury ; at the moment of re-establishing the current a current appears in the galvanometer cir- cuit. It lasts for a very short time and then disap- pears, provided no change takes place in the primary circuit. 2. Supposing, next, the primary current to be flowing steadily, let it be interrupted by removing one of the electrodes from the mercury ; at that moment a current appears in the secondary circuit, as indi- cated by the swing of the magnetic needle. It lasts also a very short time and then disappears. This phenomenon is called INDUCTION ; the primary current is the inducing, and the secondary the induced, current. 3. If the primary current be flowing,. Please note that these images are extract
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