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<p>[QUOTE=&quot;willieboyd2, post: 1471870, member: 4910&quot;]I wrote a term paper for a high-school class in 1964 on this subject.</p><p><br /></p><p>When the price of silver went up due to the Vietnam war inflation, the US Government had to remove silver from coins and replace it with another metal.</p><p><br /></p><p>The coins had to work in vending machines, most of which &quot;tested&quot; coins using an electrical current.</p><p><br /></p><p>Copper and silver have similar electrical properties, so copper was used.</p><p><br /></p><p>The copper-nickel clad covering was to make the coins look somewhat &quot;silver&quot;.</p><p><br /></p><p>Got an &#039;A&#039; on the paper.</p><p><br /></p><p><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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