ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 1
stones were products of nature and not the result of the efforts
of man. The Greeks called these substances magnetite.
The Chinese are said to have been aware of some of the effects
of magnetism as early as 2600 B.C. They observed that stones
similar to magnetite, when freely suspended, had a tendency to
assume a nearly north and south direction. Because of the
directional quality of these stones, they were later referred to
as lodestones or leading stones.
Natural magnets, which presently can be found in the United
States, Norway, and Sweden, no longer have any practical use as
it is now possible to easily produce more powerful magnets.
(3) Artificial Magnets. Magnets produced from magnetic
materials are called artificial magnets. They can be made in a
variety of shapes and sizes and are used extensively in
electrical apparatus. Artificial magnets are generally made
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