Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
e earth is always austral, andthe opposite end boreal, while the central portionis neutral. If the experiment were made south of theequator of the earth, the polarity of the barwould be reversed. Ordinary crow-bars, which have been keptstanding in one place for years (when not in use),are found… … 338 MAGNETISM. Via. Ty2 llllli ^ ■iliji Hypotheses and Laws of Magnetism. 6^0. Figure 52.—Hypothesis of two magnetic fluids.— The action of the two poles of a magnet upon a piece of soft iro?i is the same; but the action of the two poles isnot the same upon another magnet If a smallmagnet, like the…
Physics · Astronomy
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