Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 316
W A. ^ 5) Pieces of common iron, which have been for a great length of time in one fixed position, or under-grouud, acquire considerable polarity—in fact, become magnets. In the Memoirs of the Academy oiSciences for 1731, we find an account of a large bell at Marseilles having an axis of iron: this…
Mechanical engineering · Mechanics · Engineering
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