LYCOS RETRIEVER 
Nickel: Coins
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Nickel had been in use centuries before its actual discovery and isolation. As far back as 3500 BC Syrian bronzes contained a small amount of the element. In 235 BC, coins in China were minted from nickel. However there was no real documentation of the element until thousands of years later.
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Nickel is one of the five ferromagnetic elements. However, the U.S. "nickel" coin is not magnetic, because it actually is mostly (75%) copper. The Canadian nickel minted at various periods between 1922-81 was 99.9% nickel, and these are magnetic. Nickel is ... a naturally magnetostrictive material, meaning that in the presence of a magnetic field, the material undergoes a small change in length.[4] In the case of Nickel, this change in length is negative (contraction of the material), which is known as negative magnetostriction.
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In 1913, the “Buffalo” or “Indian Head” Nickel was introduced. The purely American design featured the head of an Indian Chief on the obverse and an American bison on the reverse. The earliest versions had the words “FIVE CENTS” on a raised mound at the base of the reverse. Mint officials feared that the words would wear off the coin too easily, so the later versions of the 1913 Nickel have the words “Five Cents” in a recessed area. Key dates in the series include 1913-S Type 2, the 1914/3 overdate, the 1918/7-D overdate and the 1937-D “Three Legged.”
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