<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif">On Wed, Jul 12, 2017 at 10:58 AM, Dave Sill </span><span dir="ltr" style="font-family:arial,sans-serif"><<a href="mailto:sparge@gmail.com" target="_blank">sparge@gmail.com</a>></span><span style="font-family:arial,sans-serif"> wrote:</span><br></div><div class="gmail_extra"><div class="gmail_quote"><span style="font-size:large;font-family:arial,helvetica,sans-serif">​</span></div></div><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​> ​</div>The circle made by a blacksmith is an approximation of the mathematical ideal circle.</div></div></div></div></blockquote><div><br></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​Are you sure it isn't ​the other way around? </div> </font></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​> ​</div>The hurricane model isn't an ideal that real hurricanes try to achieve.</div></div></div></div></blockquote><div><br></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​</div><font size="4">There is no universal agreement on what is ideal and what is not, but I think it's objectively true that a real Hurricane is a richer more complex phenomenon than the meteorologist's<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ model of it. It's not clear to me there isn't a similar relationship between Euclid's circle and a blacksmith's.   ​</div></font></div><div><font size="4"><font face="arial, helvetica, sans-serif"><br></font></font></div><div><font size="4"><font face="arial, helvetica, sans-serif"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​  John K Clark​</div><br></font><br> </font></div><div><font size="4"><br></font></div><div><font size="4"> </font></div></div></div></div>