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<p>[QUOTE=&quot;Conder101, post: 603878, member: 66&quot;]To get an idea of how much that 20% difference means, if you took a one foot ruler, put your fulcrum at the 6 inch mark and lay a zinc cent on it so it was centered over the 1/2 inch mark you would have to put another zinc at the 11 1/2 mark to balance it.&nbsp; But a copper cent would balance it it it was centered over the 8 1/4 inch mark.&nbsp; That is a difference of 3 1/4 inches in placement.&nbsp; So if you put an unknown piece at say the 10 inch mark, if it is copper it will go CLUNK because you are well past the balance point. If it is zinc it won&#039;t move because you aren&#039;t even close to the balance point yet.</p><p><br /></p><p>A lot of people use popsicle sticks or shorter 6 inch rulers but the longer lever arms of the foot ruler gives you a much greater difference in the position of the balance points.&nbsp; On a six inch ruler with a zinc on the 1/2 inch, a zinc balances at 5 1/2, but a copper balances at 4 1/8.&nbsp; A difference of only 1 3/8 inches.[/QUOTE]</p><p><br /></p>

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