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<p>[QUOTE=&quot;calcol, post: 2788276, member: 77639&quot;]So, what happens if your probe placement on the edges is off a couple of degrees from being on a diameter chord?&nbsp; Measured resistance should be less than for a diameter chord.&nbsp; Right?&nbsp; I&#039;m assuming resistance would be measured edge to edge as opposed to obverse to reverse.&nbsp; Geometrical misalignment would be more likely in the latter case, plus resistance would be much lower than edge to edge through a diameter chord. And what do you do if the coin isn&#039;t a perfect cylinder, like many ancient and error coins?</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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