On the Magnet, by William Gilbert

Chap. xx. An armed Loadstone raises an armed Loadstone, . which also attracts a third; which likewise happens, though the virtue in the first be somewhat small.

M agnets armed cohære firmly when duly joined, and accord into one; and though the first be rather weak, yet the second one adhæres to it not only by the strength of the first, but of the second, which mutually give helping hands; also to the second a third often adheres and in the case of robust stones, a fourth to the third.


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