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<p>[QUOTE=&quot;calcol, post: 2762440, member: 77639&quot;]I&#039;m quite familiar with metric and nonsensical units and their conversion.&nbsp; I was rounding and don&#039;t think it would make any difference to a diver whether the distance to the water was 18, 20, or 19.375 meters.</p><p><br /></p><p>A bit of water on a planchet has a much stronger backing than the surface of deep water.&nbsp; I don&#039;t think lowering or eliminating the surface tension would lessen the blow one bit for someone diving from 60 feet (or 20 meters) into water.&nbsp; If you think it would, give it a try; put detergent in a diving pool.&nbsp; And the pressure at the surface of the water where impact occurs would be zip.&nbsp; You would have to go very deep indeed into the sea to find pressures comparable to those generated by a coining press.&nbsp; Depths no one diving from any height would achieve.</p><p><br /></p><p>However, I don&#039;t think any theoretical arguments will be convincing on whether water on a planchet will leave a mark when hit with dies moving at high relative velocity.&nbsp; Only an empirical test is likely to provide an answer acceptable to me and most folks.&nbsp; Until that time, I&#039;m firmly in the don&#039;t know camp, but happy to shoot arrows at theoretical arguments.&nbsp; I spent some of my youth in Missouri; so, show me.</p><p><br /></p><p>Speaking of which, there&#039;s a good chance experiments with strike-throughs using a variety of substances have been done by mint employees.&nbsp; Some authorized, most probably not.&nbsp; Who among us hasn&#039;t put a coin on a train track?&nbsp; Does your chewing gum lose its flavor riding on a planchet through a coin press?&nbsp; It must be easy for employees to create a variety of errors; getting error coins out of the mint is another story.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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