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<p>[QUOTE=&quot;cmezner, post: 14637391, member: 87809&quot;]The real question is, why adopt the dished design anyway? One thing, and really one thing only is sure about this, which is that it was not an easy thing to do. In the first place, the designs on the dies with which the blank coins were struck were carved in such a way as to keep the design correctly proportioned: it looks straight even though it’s bent, something that becomes very evident when you try to photograph them in such a way that they face you but are still clearly concave. Scanning is better for this because the fall of light emphasizes shadow, but with adequate lighting the concavity is quite often visually undetectable in conventional photography. So that was cunning artistry, and not least because the dies themselves, we are fairly sure, were made curved, rather than deforming flat coins by striking them.</p><p>In fact, it seems likely that the flat blanks were first struck with blank dies to curve them, and then the resulting curved blanks were struck with two obverse dies, one for each side of the coin’s design, to ensure a good impression all over the coin’s surface. This means that the manufacturers were readier to triple the production process complexity than to make dies that fitted each other snugly, apparently, but we can mainly take from this: there must have been a point to all this, but what?</p><p>The concavity may make the coins harder to bend, but it makes them far more prone to cracking, because the edges come out so thin, as you see below. And once a coin is cracked, it’s actually in much more danger of snapping.</p><p>They just don’t stack, seriously. Actually a silly explanation. The manufacture was not regular enough to guarantee anything but the most basic fit. </p><p>quoted from: </p><p><a href="https://tenthmedieval.wordpress.com/2015/07/20/a-problem-of-concavity/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://tenthmedieval.wordpress.com/2015/07/20/a-problem-of-concavity/" rel="nofollow">https://tenthmedieval.wordpress.com/2015/07/20/a-problem-of-concavity/</a></p><p><br /></p><p>The problem with trachys was producing two dies with the exact same curve shape. If the obverse was more convex than the reverse was concave, the center of the design would be poorly transferred. If the obverse was less convex than the reverse was concave, the centers cold be clear but the edges would be weak. In order to produce a well struck scyphate it is necessary that both obverse and reverse dies have the same radius of curvature in order to match exactly.</p><p><br /></p><p>Quoted from&nbsp; <a href="https://community.vcoins.com/celator-vol-12-no-06/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://community.vcoins.com/celator-vol-12-no-06/" rel="nofollow">https://community.vcoins.com/celator-vol-12-no-06/</a>[/QUOTE]</p><p><br /></p>

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