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)
629. Figure 54.—Magnetic curves with two magnets and unlike poles.—Place theSX, of two powerful bar-mag-nets, placed about two inchesapart, and project over themthe fine iron filings as before.Magnetic lines of force, bothstraight and curved, and pro-ceeding from similar points ofeach bar, will be…
Physics · Astronomy
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