Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 22
ive and negative poles. This con-stancy of direction in a freely-suspended magnet has led toits use in Europe since the twelfth century, and from muchearlier times by the Chinese, for directing the course in navi-gation. On this account the magnet is called the loadstone(more correctly spelt… … Fig. 3. 4. Action of Magnetic Poles on each other.—We have seen that the poles of a magnet differ from each otherin their behaviour under the action of the earth. We nownaturally inquire what is the action of the poles of two dif-ferent magnets on each other. Suspend one magnet freely,having marked…
Electricity
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