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<p>[QUOTE=&quot;physics-fan3.14, post: 25971181, member: 19165&quot;]It has less to do with the large empty fields. It&#039;s more about the radius of the fields. On a Liberty Head, it has a smooth, shallow radius (depth) of the fields. On the Renaissance coinage (Buffalo nickels, St. Gaudens, etc.) they have much deeper fields, but also tend to have non-uniform radii. Based on the position and orientations of the main devices, the curvature might be a bit different in the left vs. right fields to maintain the effect of depth. </p><p><br /></p><p>Think about polishing a bowling ball (uniform radius) and tumbling rocks... one is much easier to get PL fields than the other.[/QUOTE]</p><p><br /></p>

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