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<p>[QUOTE=&quot;brassnautilus, post: 2139721, member: 74300&quot;]I&#039;m fairly certain magnifying glasses were in relatively wide use by the time these coins were struck. Optic manufacturing predates our type of coins (metallurgy came later). They were able to polish convex lenses to high degree of precision by the time of Archimedis, and roman left us glassware that have nano surfaces <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p><a href="http://www.ancient-wisdom.co.uk/optics.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ancient-wisdom.co.uk/optics.htm" rel="nofollow">http://www.ancient-wisdom.co.uk/optics.htm</a>[/QUOTE]</p><p><br /></p>

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