. Electrical instruments and telephones of the Signal corps . Fig. 44. THE POLAR 1)1 PLEX. This duplex involves in its operation, among other principles, thisone, that when a current of electricity flows in a coil of wire sur-rounding a soft iron core the iron not only becomes magnetized, butalso that its magnetic polarity depends upon the direction in whichthe current flows in the coil around the core. For instance, if, as in figure 44, the current circulates around thecore from left to right, as indicated bv the arrows, the left hand end 84 ELECTRICAL INSTRUMENTS V. S. SIGNAL CORPS. wil
. Electrical instruments and telephones of the Signal corps . Fig. 44. THE POLAR 1)1 PLEX. This duplex involves in its operation, among other principles, thisone, that when a current of electricity flows in a coil of wire sur-rounding a soft iron core the iron not only becomes magnetized, butalso that its magnetic polarity depends upon the direction in whichthe current flows in the coil around the core. For instance, if, as in figure 44, the current circulates around thecore from left to right, as indicated bv the arrows, the left hand end 84 ELECTRICAL INSTRUMENTS V. S. SIGNAL CORPS. will be a north pole and the right end a south pole. If from rightto left, as in figure 45. the right-hand end will be a north pole and theleft a south pole. This will be the case regardless of the shape ofthe Fig. 4o. It is known that the north pole of one will attract the south poleof another magnet, and vice versa, and that the south pole will repela south pole and a north pole a north pole. In figures 46 and 47 thenorth pole of a freely suspended permanent magnet .1 is placed between
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