"The idea of lines of force and their exhibition by means of iron filings was nothing new. They had been observed repeatedly, and investigated mathematically as an interesting curiosity of science. But let us hear Faraday himself... "It would be a voluntary and unnecessary abandonment of most valuable aid if an experimentalist, who chooses to consider magnetic power as represented by lines of magnetic force, were to deny him the use of magnetic filings. By their employment he may make many conditions of the power, even in complicated cases, visible to the eye at once, may trace the varying direction of the lines of force and determine the relative polarity, may observe in which direction the power is increasing or diminishing, and in complex systems may determine the neutral points, or places where there is neither polarity nor power, even when they exist in the midst of powerful magnets. By their use probable results may be seen at once, and many a valuable suggestion gained for future leading experiments.""
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On Action at a Distance
On Action at a Distance, is an article by James Clerk Maxwell which appeared in Nature (Mar 6, 1873) Vol VII, Issue 175. It was also published, with minor changes, both in the Proceedings of the of Great Britain Vol. VII. 1876, and in Vol. 2, The Scientific Papers of James Clerk Maxwell in 1890. The article is a discussion of scientific and mathematical investigations relating to the concepts of , Michael Faraday's lines of force, and the luminiferous aether. Maxwell was personally responsible f
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