A treatise on magnetism, in theory and practice, with original experiments / [Tiberius Cavallo].

  • Cavallo, Tiberius, 1749-1809
Date:
1787
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on magnetism, in theory and practice, with original experiments / [Tiberius Cavallo]. Source: Wellcome Collection.

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    t 2 Laws of Magnetism. the fame properties may be communicated to iron, fteel, and other ferruginous fub- flances; thofe bodies, after having ac- quired the magnetical properties, are called artificial magnets. A magnet, v/hether natural or artificial, is always polfefled of the following cha- radteriftic properties, which are infeparable from its nature ^ fo that a body cannot be called a magnet unlefs it be poffefled of all thofe properties at the fame time: nei- ther is there any inftance of a magnet’s being produced, which had only one or a few of thofe properties, without fhewing any of the reft. 1. A magnet attradls iron and other ferruginous fubftances. 2. When a magnet is placed fo as to be at liberty to move itfelf eafily, as, if it be fufpended by a thread, &c. it turns one, and conftantly the fame part of its others, from Heraclea, a city of Magnefia, a part of ancient Lydia, where it is fuppofed to have been firft found. It has likewife been called lapisnauticusy from its ufe in navigation; andy?im/^/, from its property of attrafting iron, which metal is called in Greek. furface /