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<p>[QUOTE=&quot;desertgem, post: 2359054, member: 15199&quot;]The sketch in #9 above is often misinterpreted by new people to the process of hub doubling, in that they remember notching , but ignore the extra thickness and separation line. Notching can occur with machine doubling that is of very low height ( of course the notching will be of very low height also), but people ignore the height in their excitement of riches.</p><p><br /></p><p>As for the inexpensive USB microscopes, magnification is over exaggerated, resolution is poor due to cheaper array chip ( USB cameras for amateur astronomy use chips costing in the hundreds by themselves and need cooling devices to stay on. You get what you pay for.</p><p><br /></p><p>Here is a composite of 2 photos I took&nbsp; through an optical scopes of flow lines on the surface of a peace dollar for a thread post,&nbsp; the left one at 100X&nbsp; and the right at 400X.</p><p><img src="http://i455.photobucket.com/albums/qq279/desertgem/peacecomp.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>If you can find a USB scope that can do this, I would be interested. USB 800X, ~afraid not.[/QUOTE]</p><p><br /></p>

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