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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1840 Excerpt: ...its continual motion round the loadstone, a vortex which reconducts the subtile matter from one pole to the other; and this motion is, without doubt, extremely rapid. The nature of the loadstone consists, then, in a continual vortex, which distinguishes it from all Other bodies; and the earth itself, in the quality of a loadstone, must be surrounded with a similar vortex, acting everywhere on magnetic needles, and making continual efforts to dispose them according to its own direction, which is the same I formerly denominated the magnetic direction: this subtile matter is continuajly issuing at one of the magnetic poles of the earth, and after having performed a circuit round to the other pole, it there enters, and pervades the globe through and through to the opposite pole, wh ere it again escapes. We are not yet enabled to determine by which of the two magnetic poles of the earth it enters or issues; the phenomena depending on this have such a perfect resemblance, that they are indistinguishable. It is undoubtedly, likewise, this general vortex of the globe which supplies the subtile matter of every particular loadstone to magnetic iron or steel, and which keeps up the particular vortices that surround them. Previous to a thorough investigation of the nature of this subtile matter, and its motion, it must be remarked, that its action is confined to loadstone, iron, and steel; all other bodies are absolutely indifferent to it: the relation which it bears to those must therefore be by no means the same which it bears to others. We are warranted to maintain, from manifold experiments, that this subtile matter freely pervades all other bodies, and even in all directions; for when a loadstone acts upon a needle, the action is perfectly the same whether another...
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