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The penny battery is a voltaic pile which uses various coinage as the metal disks (pennies) of a traditional voltaic pile. The coins are stacked with pieces of electrolyte soaked paper in between (see diagram at right). The penny battery experiment is common during electrochemistry units in an educational setting.
The brass threepence, or "threepenny bit", was a twelve-sided British coin equivalent to 1 ⁄ 80 of a pound. Struck between 1937 and 1967, with a final issue for collectors dated 1970, it was the first British coin that was not round.
Hard Times Tokens are American large or half cent-sized copper or brass tokens, struck from about 1833 through 1843, serving as unofficial currency. These privately made pieces, comprising merchant, political and satirical pieces, were used during a time of political and financial crisis in the United States.
A penny, on its face, is worth one cent. $0.01 U.S. dollars. On the other hand, that same penny -- if melted down for the copper it contains -- could be worth quite a bit more.
Brass: J2052 United States Mint Zinc: J2053 United States Mint Zinc-coated steel: J2054/P2074 United States Mint This composition was chosen for the 1943 cent: Manganese: J2055/P2075 United States Mint White metal: J2056 United States Mint Aluminum: J2057/P2076 United States Mint Lead: J2058 United States Mint Bakelite: J2067/P4001 Bakelite ...
The 1974 aluminum cent was a one-cent coin proposed by the United States Mint in 1973. It was composed of an alloy of aluminum and trace metals, and it was intended to replace the predominantly copper–zinc cent due to the rising costs of coin production in the traditional bronze alloy.
The unique composition of the coin (low-grade steel coated with zinc, instead of the previously 95%-copper-based bronze composition) has led to various nicknames, such as wartime cent, steel war penny, zinc cent and steelie. The 1943 steel cent features the same Victor David Brenner design for the Lincoln cent which had been in use since 1909.
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