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<p>[QUOTE=&quot;longnine009, post: 2422217, member: 1886&quot;]A Guide Book to Numismatical Gadgets.</p><p><br /></p><p>Once upon time there was a gadget to measure die rotation. There was a gadget that detected the weight difference between&nbsp; a zinc cent and brass cent. There was a clamping gadget for cracking slabs.&nbsp; There was some kind of container-like gadget that you placed your coin in and placed a Polariod over that to do some &quot;coin photography.&quot;</p><p><br /></p><p>There have been numerous&nbsp; gadgets for detecting counterfeit coins or fake bullion.</p><p><br /></p><p>I hope I&#039;m remembering this right but I remember a strange&nbsp; letter in the 80&#039;s to one of the publications ( I think the Numismatist)&nbsp; from someone who claimed they had a process for toning coins that did not involve any chemical or mechanical methods or even anything touching or attached to the coin. Maybe it used mojo waves?&nbsp; But I never heard anthing more about it. Does anyone remember that?</p><p><br /></p><p>I bet there are hundreds if not thousands&nbsp; of coin collecting&nbsp; gadgets from past centuries. What about a circular slide rule for computing the investment potential of a coin? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie7" alt=":p" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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