<div dir="auto">How did the melting wax exit the sphere? Probably a hole. So how did you patch the hole to retain perfect symmetry<div dir="auto">T? </div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Feb 1, 2019, 10:03 PM Edward Angel <<a href="mailto:angel@cs.unm.edu" target="_blank" rel="noreferrer">angel@cs.unm.edu</a> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">For two summers while I was an undergrad I worked on a crack propagation project that was using high speed photography to image crack propagation on thin seamless 18” copper cylinders. During the first summer, I made the cylinders by first making solid wax molds that I lathed to the right shape. I then electroplated copper on them before melting the wax away. The second summer I worked on the photography side which was right out of Muybridge. The film was in a 6 foot in diameter ring. In the middle was a spinning prism at the end of a turbine which sent the light around the ring of film. The whole thing was triggered by the crack breaking a small wire. We all had to hide behind a barrier during each run as the whole assembly <div>was pretty delicately balanced.</div><div><br></div><div>Ed<br><div>
<div dir="auto" style="word-wrap:break-word;line-break:after-white-space"><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><div>____________</div><div><br></div><div><div>Ed Angel<br><br></div><div>Founding Director, Art, Research, Technology and Science Laboratory (ARTS Lab)<br>Professor Emeritus of Computer Science, University of New Mexico<br><br>1017 Sierra Pinon</div><div>Santa Fe, NM 87501<br>505-984-0136 (home)<span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span> <span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span><a href="mailto:angel@cs.unm.edu" rel="noreferrer noreferrer" target="_blank">angel@cs.unm.edu</a></div><div>505-453-4944 (cell) <span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span><span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span><a href="http://www.cs.unm.edu/~angel" rel="noreferrer noreferrer" target="_blank">http://www.cs.unm.edu/~angel</a><br><span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span> <span class="m_7722314446322226681m_6400317109174194694Apple-tab-span" style="white-space:pre-wrap"> </span></div></div></div><br class="m_7722314446322226681m_6400317109174194694Apple-interchange-newline"></div><br class="m_7722314446322226681m_6400317109174194694Apple-interchange-newline">
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<div><br><blockquote type="cite"><div>On Jan 30, 2019, at 5:15 AM, Tom Johnson <<a href="mailto:tom@jtjohnson.com" rel="noreferrer noreferrer" target="_blank">tom@jtjohnson.com</a>> wrote:</div><br class="m_7722314446322226681m_6400317109174194694Apple-interchange-newline"><div><div dir="auto">See <a href="https://www.nytimes.com/2015/11/23/science/a-side-serving-of-science-for-your-next-birthday-party.html?smid=fb-nytscience&smtyp=cur" rel="noreferrer noreferrer" target="_blank">https://www.nytimes.com/2015/11/23/science/a-side-serving-of-science-for-your-next-birthday-party.html?smid=fb-nytscience&smtyp=cur</a></div>
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