Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ofthe earths magneticfield may be consid-ered to emanate fromthe true N-magneticpole in the southernhemisphere, and curve around over the surface of the earth,entering again at the true S-pole. The lines of force act ona freely suspended magnet in such a manner, that it turnson its axis, until it lies as nearly as possible in the directionof the lines of force, according to the principle enunciated inII 43. 50. Graphical Representation of the Earths Mag-netic Field.—Magnetise a large
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ofthe earths magneticfield may be consid-ered to emanate fromthe true N-magneticpole in the southernhemisphere, and curve around over the surface of the earth,entering again at the true S-pole. The lines of force act ona freely suspended magnet in such a manner, that it turnson its axis, until it lies as nearly as possible in the directionof the lines of force, according to the principle enunciated inII 43. 50. Graphical Representation of the Earths Mag-netic Field.—Magnetise a large steel sphere, such as is usedin roller bearings, by placing it between the unlike poles oftwo bar electromagnets so that its diameter and the axis ofthe magnets form a straight line. When plunged into filingsthe poles are readily observed. Cut a hole, equal to the di-ameter of the ball, in a sheet of cardboard and place it overthe sphere horizontally so that its plane passes through theaxis of the sphere containing the poles. Make a graphicalfield by the aid of iron filings, as shown in Fig. 58, and you. Fig. -The Earths Magnetic Polesand Equator. EARTHS MAGNETISM. 43
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
