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Message:: [QUOTE="GDJMSP, post: 1842914, member: 112"]I've explained it before in longer more detailed posts on the subject. It's really a simple matter of mathematics. Picture two circles with circle #1 being the die and other circle #2 being the zinc plate. A dollar die, circle #1, is less than 1 1/2 inches in diameter, the zinc plate, circle #2, is approx. 12 inches in diameter. The degree of arc that occurs when those two circles are interposed upon one another, in other words when the die touches the plate, is such that the polish lines formed on the die are not truly a straight line but they do appear to be to the eye because the arc of the plate is so much bigger than the arc of the die. The setup is as I described. The zinc plate is horizontal and spinning. The die is held stationary in a device that operates similar to that of a drill press that pushes the die down against the zinc plate. And that is how the polishing is done. The source of this information came from an original article published in the Numismatist back in 1915. And it described the above method of die polishing as the current method as well the method that had been in use for many years, since before Morgan dollars existed. That said, were there other methods used at other times ? No doubt there were, before and possibly after. But that does not discount the method I have described being used at the time I described.[/QUOTE]