Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 318
particular experimental inquiries or other purposes, thekeeper K may be removed, but it should be replaced -when the magnet is not in use. It we Buspend a magnet by a fine silk fibre over another magnet, or near another magnet also sus-pended, the poles of these magnets will arrange themselves in… … M V Pieces of common iron, which have been for a great length of time in one fixed position, or under-ground, acquire considerable polarity—in feet, become magnets. In the Memoirs of the Academy 01 1 1731, we find an account of a large bell at Marseilles having an axis of iron: thirested on stone…
Mechanical engineering
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