. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. PHYSIOLOGICAL PHYSICS. [Chap. APf side of the key carry a wire to the apparatus to which the current is being conveyed, represented by APP. From the apparatus take a wire to 4 011 the opposite side of the key, and from 3 on that side take a wire back to E to the negative pole N. Lower the bridge so as to " close the key," and now follow the direction of the current. It passes from P to A ; but as soon as A is reached t
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. PHYSIOLOGICAL PHYSICS. [Chap. APf side of the key carry a wire to the apparatus to which the current is being conveyed, represented by APP. From the apparatus take a wire to 4 011 the opposite side of the key, and from 3 on that side take a wire back to E to the negative pole N. Lower the bridge so as to " close the key," and now follow the direction of the current. It passes from P to A ; but as soon as A is reached two path- ways are open, one by the wire from 2 round the apparatus, Fig. 31.—Friction Key in ,-, -, u i Short Circuit. then on to B, and so on back to E, the other from A, straight across the bridge to B, so gaining 3, and passing to E. The first is a long route presenting considerable resis- tance ; the second is a short circuit, and, since the bridge is of large section, presents no resistance to speak of. When, therefore, the key is closed, all the current will pass straight across the bridge back to the battery, and none will go the long route, owing to the great difference of resistances. The battery cur- rent is then said to be short-circuited, arid the key is interposed in SHORT CIRCUIT. * Another term for short circuit is accessory circuit. When, however, the bridge is raised, the key is opened, and in that case the current has no option, but must go the long route, the short circuit being inter- rupted. With a key in short circuit, therefore, closing the key means interrupting the current in the apparatus^ and opening the key means sending on the current to the apparatus. The same key may be used in a simple * For the sake of those who read German and who might have difficulty in fiuding the meaning of the word, it maybe noted that nebenscldiessung is used as we use short Please note that these images are extracted from scanned page images that may have bee
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