. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Pieces of common iron, which have been for a great length of time in one fixed position, or under-ground, acquire considerable polarity—in fact, become magnets. In the Memoirs of the Academy ofSciences for 1731, we find an account of a large bell at Marseilles having an axis of iron: this axisrested on stone blocks, and threw off from time to time great quantities of rust, which, mixing with theparticles of stone and the oil used to facilitate the motion, became conglomerated into a hardened mass :this mass ha
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Pieces of common iron, which have been for a great length of time in one fixed position, or under-ground, acquire considerable polarity—in fact, become magnets. In the Memoirs of the Academy ofSciences for 1731, we find an account of a large bell at Marseilles having an axis of iron: this axisrested on stone blocks, and threw off from time to time great quantities of rust, which, mixing with theparticles of stone and the oil used to facilitate the motion, became conglomerated into a hardened mass :this mass had all the properties of the native magnet The bell is supposed to have been in the sameposition for 400 years. The artificial mar/net.—To make an artificial magnet, procure a small bar of steel about 8 inches inlength, ith of an inch wide, and |th of an inch thick, or a piece of common steel wire of about the samelength, and from £th to Jth of an inch in diameter. Let the steel be well hardened and tempered byplunging it at a cherry-red heat into cold water; when cold and po
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
