Message:

<p>[QUOTE=&quot;brg5658, post: 1842569, member: 29751&quot;]Doug, if this zinc plate impregnated with die polishing compound is &quot;spinning&quot; (as you said above), why are these types of lines always parallel and in straight lines on the coin?&nbsp; I have never seen re-polishing lines that follow a circular pattern as would be expected by the method you described.&nbsp; Do I presume this zinc plate is massive in diameter so said lines appear parallel and straight?</p><p><br /></p><p>EDIT (added later):&nbsp; <i>I believe a more accurate description would be that the edge of the plate is used (a lap-wheel) similar to a grinding wheel or a wire wheel.&nbsp; According to &quot;From Mine to Mint&quot;&nbsp; pp 424-426, this wheel is made of tin, pewter, or some other soft metal.&nbsp; Emery powder is used of varying grits.&nbsp; Sometimes it was noted that a leather band, a little emery powder, and a bit of oil were used on the wheel to smooth surfaces very lightly.</i>[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in