An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 109
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… … Fig. 43. — Lines of force traced by iron filings. to contract and are thus pulling on the poles at their ends.They 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…
Electricity · Magnetism
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