The pennies you used in your "experiment" were 97.5% ZINC with a very thin copper plating on them. Back in 1982, the US mint stopped using the full copper planchets for stamping out pennies due to the high cost of copper. Currently, there is more copper in any other coin than in a penny. Even a nickel is 75% copper. A dime is 8-1/3% nickel and the balance is copper. All other formerly silver coins have a similar composition as the dime.
I suggest that if you want to test the effectiveness of copper, you might want to use ANY OTHER coin than a penny, or use a penny dated previous to 1982.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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