An elementary book on electricity and magnetism and their applications . e 43, or by the path of travel of the supposed free magnetpole shown in figure 40. We shall find this conception oflines of magnetic force or magnetic flux a convenient way ofremembering how a magnet will affect other magnets in itsvicinity. 63. Lines of force like elastic fibers. Michael Faraday (PlateV, opposite p. 88) thought of these lines of force as havinga much more real meaning than this. He thought of them * One dyne = grams = pounds. 88 ELECTRICITY AND MAGNETISM as actually existing throughout
An elementary book on electricity and magnetism and their applications . e 43, or by the path of travel of the supposed free magnetpole shown in figure 40. We shall find this conception oflines of magnetic force or magnetic flux a convenient way ofremembering how a magnet will affect other magnets in itsvicinity. 63. Lines of force like elastic fibers. Michael Faraday (PlateV, opposite p. 88) thought of these lines of force as havinga much more real meaning than this. He thought of them * One dyne = grams = pounds. 88 ELECTRICITY AND MAGNETISM as actually existing throughout the space around every magnet,even when there are no filings to show them. He believedthat they represent a real state of strain in the ether in whichall material bodies are immersed. Even now, however, weknow very little about what the ether really is. We knowsimply that it is not a kind of matter, but something muchmore subtle and fundamental. At any rate, these lines of force of Faradays act as if theywere stretched fibers in the ether which are continually trying. Fig. 43. — Lines of force traced by iron filings. to contract and are thus pulling on the poles at their also act as if they were trying to swell out sidewise as theycontract, and thus seem to crowd each other apart. It is noteasy to see why lines of force have these properties, but oncethe properties are assumed it is easy to reason out from themwhat will happen in many practical cases. 64. Oersteds discovery. The real connection which existsbetween magnetism such as is exhibited by the steel magnetsand currents of electricity was not generally known until1820, when Oersted, a Danish scientist, published the fact PLATE V.
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