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<p>[QUOTE=&quot;Conder101, post: 551015, member: 66&quot;]He is taking about a piece of Bryan Money.&nbsp; I is a large disk of silver that has the image of a cartwheel on the reverse the same size as a silver dollar (Hence the &quot;cartwheel&quot;) and the usual comment that this is the size of the current dollar and how the full size disk would be the size of a full value silver dollar on a bimetallic&nbsp; 16 to 1 standard.&nbsp; Bryan money is interesting but I really don&#039;t know much about it.</p><p><br /></p><p>I notice that one thing yo don&#039;t cover is what causes the cartwheel effect.</p><p><br /></p><p>The cartwheel &quot;spokes&quot; are always perpendicular to the direction of the incoming light.&nbsp; For example if the light is coming in from 3:00 the spokes will be from the center toward 12:00 and 6:00.&nbsp; They are created by the incoming light&nbsp; being reflected up into your eyes by the flowlines on the surface of the coin.&nbsp; The flowlines on the coin are created by the wear flowlines on the surface of the die.&nbsp; A brand new die has no flowlines and the surfaces of the coins struck from them are often mirror finished or prooflike.</p><p><br /></p><p>As the die starts to wear the first cartwheel begins to appear and the spokes are very tight or narrow.&nbsp; This is because only the lines that are almost exactly perpendicular to the light are able to reflect the light up into your eyes.&nbsp; s the die wear more and the flowlines become heaviler and deeper lines that are further off from the perpendicular are also able t catch and reflect the light and the spokes become broader.</p><p><br /></p><p>But as they become broader they also become less intense or less flashy.&nbsp; The problem is that slight wear to the coin can have the same effect of broadening and dulling the cartwheel as well because the slight wear on the microscopic flowlines broadens them and makes them more able to catch the light.</p><p><br /></p><p>After the die wears enough that the &quot;spokes&quot; approach 20% of the circumference of the coin the coin is taking on more of a satin appearance than a cartwheel &quot;flash&quot;.[/QUOTE]</p><p><br /></p>

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