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<p>[QUOTE="cladking, post: 3188224, member: 68"]Many years ago I had an odd experience (what's new). I tried to spin around in my tracks while walking on a concrete floor and much to my surprise coasted right past an 180 degree turn. Under my the ball of my right foot was a penny that facilitated the turn. Said penny now had very heavy circular scrapes. </p><p><br /></p><p>Almost all of these circles are caused by rolling machines but there are less common causes as well. Coins are usually convex on the obverse which better allows them to turn while under force and if turned under force they can be scraped if there are sharp objects in contact with them. This can happen with all orders of machines or even a walker changing directions. </p><p><br /></p><p>By the way the convexity of most coins causes more than 50% of falling coins to come down obverse first.[/QUOTE]</p><p><br /></p>
[QUOTE="cladking, post: 3188224, member: 68"]Many years ago I had an odd experience (what's new). I tried to spin around in my tracks while walking on a concrete floor and much to my surprise coasted right past an 180 degree turn. Under my the ball of my right foot was a penny that facilitated the turn. Said penny now had very heavy circular scrapes. Almost all of these circles are caused by rolling machines but there are less common causes as well. Coins are usually convex on the obverse which better allows them to turn while under force and if turned under force they can be scraped if there are sharp objects in contact with them. This can happen with all orders of machines or even a walker changing directions. By the way the convexity of most coins causes more than 50% of falling coins to come down obverse first.[/QUOTE]
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