The three circuits: a study of the primary forces . 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
The three circuits: a study of the primary forces . 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. filings having been repelled from the centre of it their weight has carried themaway. The second example showsboth attraction and repulsion ;but as the repel 1 ant force is notsufficient to overcome bothweight and friction, and pushthe filings out to their properplaces, the course of the secondcircuit is not perfectly assume, that if the magnet and filings could beFlG 5# freely suspended, the latter would be found arranged as inFig. 5. So far we have had only anequatorial view of a magnetand its forces in plane. , represents a polar projectionof the same magnet. Here re-pulsion, or the third circuit, isall that appears. Pictures can go no we desire to see a magnet with all its forces inoperation at once, we must imagine it and the filings «\V\\«7,« ? —-^-»\< .v.*,.»; ft, :??: -,-::: - \\\\
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Keywords: ., bookcentury1800, bookdecade1890, bookidthreecircuit, bookyear1892
