The three circuits: a study of the primary forces . a singleline of both circuits. The return of the second circuit through the at- * The north is again simply taken as a starting magnetic parallels do not conform to any geographicaldegree of latitude. Certain points of magnetic intensity havebeen called the true magnetic poles; these are sometimesfound north and sometimes south of what may be called themean magnetic parallel. t When a magnet is heated to redness it loses permanentlyevery trace of magnetism. Iron also at a red heat ceasesto be attracted by the magnet. At temperatures
The three circuits: a study of the primary forces . a singleline of both circuits. The return of the second circuit through the at- * The north is again simply taken as a starting magnetic parallels do not conform to any geographicaldegree of latitude. Certain points of magnetic intensity havebeen called the true magnetic poles; these are sometimesfound north and sometimes south of what may be called themean magnetic parallel. t When a magnet is heated to redness it loses permanentlyevery trace of magnetism. Iron also at a red heat ceasesto be attracted by the magnet. At temperatures below redheat the magnet parts with some of its power, the loss in-creasing with the temperature. The temperature at whichother substances affected by the magnet lose their magnetism,differs from that of iron. Cobalt remains magnetic at thehighest temperature, and nickel loses this property at 662°Fahrenheit.—Universal Library, vol. ix., p. 362. WORLD FORMATION. 73 mosphere is somewhat in the tortuous direction of its inward route. Fig. 2. tt. v& From which it appears that the circuits form ajunctional union at the magnetic poles; jrIQ> 3,and that within the body of the earththey are separated by the heated por-tions of the earth. Of course the ab-sence of one form of force means thepresence of another. That is the thirdcircuit. If we dip a magnet in iron-filings,they will adhere to it as in Fig. 3. Lay a sheet of paper on a magnetand sprinkle iron-filings upon it, theywill arrangethemselves as in Fig. 4. The first example shows attraction, and therefore,the course of the first circuit. That the magnet pos-sesses any other force does not appear; because the S3! # 74 THE THREE CIRCUITS. Fig. 4.
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