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)
and K, of the Y-shaped piece of softiron, the two magnets, E and F, with theirlike poles turned in the same direction, andthe lower end of the Y-shaped iron will at-tract and hold the key. If one of the mag-nets (say F) be removed, the key will stillremain suspended; but if F be again applied,with… … 624. Figure 51.—The inductive power of the earthsmagnetism.—Bars of iron and steel, by standing a long time in a ver-tical position, will acquire polarity (646); which Fig. 51.is caused by the inductive power of the earthsmagnetism. By testing such bars with a smallneedle, as shown in the figure,…
Physics · Astronomy
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