Magnets & Magnetism Thousands of years ago it was accidentally discovered that pieces of certain grayish-black rock would cling to the iron point of a spear. This mineral rock was called "lodestone" meaning "leading stone" and consisted of a compound of iron & oxygen. Lodestone is the earth's only natural magnet.
The Greeks knew of lodestone as early as 2500 years ago. The name "magnet" refers to the Greek province of "magnesia" where natural magnets were especially plentiful.
Magnets today are man-made. The most common magnets are either alnico or ceramic magnets. Alnico magnets look like steel, but are actually a mixture, or alloy, of aluminum, nickel, and cobalt. Ceramic magnets are usually made from strontium ferrite.
Magnets will attract any object which is ferrous, i.e. containing iron. A simple magnet has two poles- the north-seeking pole and the south-seeking pole. The end of the magnet pointing toward the geographical North Pole of the earth is the north-seeking pole.
Magnets & Magnetism Sub-Categories:
Additional Magnets & Magnetism Refinements:
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Browsing 51-26 of 26 items in the Magnets & Electricity category
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Featured Toy
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Levitron Cherry Wood
Classiest Levitron Anti-Gravity Top - Elegant, wood housing with brass-tone leveling legs. Unique base design amazes onlookers as the high-flying top levitates mysteriously above the opening in the center! Strong magnetic forces hold the top and lifter plate securely in place for easy carrying and storage. A Self-Starter is highly recommended for purchase with Leviton Cherry Wood. Ease in setting the top is essential for not damaging the elegant cherry wood.
Price: $45.00
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Elkhorn, Nebraska USA 68022