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<p>[QUOTE=&quot;-jeffB, post: 1091939, member: 27832&quot;]After a month and a half, the scales finally arrived, and it looks like they&#039;ll work out quite nicely for this.</p><p><br /></p><p>I don&#039;t have statistics yet, but I&#039;ve found several FR-AG Mercuries that appear to have lost more than 10% of their weight, and a very worn Barber dime that&#039;s down more than 15%.</p><p><br /></p><p>For quarters, I found that well-worn Washingtons tend to have lost 5% or more, and a couple of dateless SLQ&#039;s were down around 8%. I also have one dateless Walker half that&#039;s down about 8%. (This assumes that they were spot-on when minted, which of course isn&#039;t necessarily true.)</p><p><br /></p><p>The milligram scale should indicate weight of even the lightest issues to within 0.1% or better; for halves and large-format dollars, it&#039;s better than 0.01%. I hope to collect distribution information for some collections of near-uncirculated coins, to approximate the distribution of weights as minted. (Are those tolerances quoted above hard cutoffs, or just particular thresholds in a normal distribution?)</p><p><br /></p><p>I did try weighing a penny before and after rubbing it on my jeans for a few seconds. The first time, it lost a milligram or two, but repeated attempts didn&#039;t show any change. I&#039;m not particularly surprised -- weight loss from a single swipe is probably in the microgram range, if that. I&#039;d love to have a microgram scale, but that would require more stable furniture, and you&#039;ve got to start worrying about the weight of fingerprints and such. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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