Yes. Cylinders not Spheres. Once I had lathed the wax and electroplated the copper shell, I put the heat back up in my vat and the wax melted and the cylinder slid off, They then crushed my precious cylinders I had worked so hard to make.
Ed ____________ Ed Angel Founding Director, Art, Research, Technology and Science Laboratory (ARTS Lab) Professor Emeritus of Computer Science, University of New Mexico 1017 Sierra Pinon Santa Fe, NM 87501 505-984-0136 (home) an...@cs.unm.edu <mailto:an...@cs.unm.edu> 505-453-4944 (cell) http://www.cs.unm.edu/~angel <http://www.cs.unm.edu/~angel> > On Feb 4, 2019, at 9:00 PM, Barry MacKichan <barry.mackic...@mackichan.com> > wrote: > > I think they were cylinders, not spheres, so there were two holes. This is > where we start talking about homology groups. > > --Barry > > On 2 Feb 2019, at 12:56, Tom Johnson wrote: > > How did the melting wax exit the sphere? Probably a hole. So how did you > patch the hole to retain perfect symmetry > T? > > On Fri, Feb 1, 2019, 10:03 PM Edward Angel <an...@cs.unm.edu > <mailto:an...@cs.unm.edu> wrote: > 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 > was pretty delicately balanced. > > Ed > ____________ > > Ed Angel > > Founding Director, Art, Research, Technology and Science Laboratory (ARTS Lab) > Professor Emeritus of Computer Science, University of New Mexico > > 1017 Sierra Pinon > Santa Fe, NM 87501 > 505-984-0136 (home) an...@cs.unm.edu > <mailto:an...@cs.unm.edu> > 505-453-4944 (cell) http://www.cs.unm.edu/~angel > <http://www.cs.unm.edu/~angel> > > > > >> On Jan 30, 2019, at 5:15 AM, Tom Johnson <t...@jtjohnson.com >> <mailto:t...@jtjohnson.com>> wrote: >> >> See >> https://www.nytimes.com/2015/11/23/science/a-side-serving-of-science-for-your-next-birthday-party.html?smid=fb-nytscience&smtyp=cur >> >> <https://www.nytimes.com/2015/11/23/science/a-side-serving-of-science-for-your-next-birthday-party.html?smid=fb-nytscience&smtyp=cur>============================================================ >> FRIAM Applied Complexity Group listserv >> Meets Fridays 9a-11:30 at cafe at St. John's College >> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> <http://redfish.com/mailman/listinfo/friam_redfish.com> >> archives back to 2003: http://friam.471366.n2.nabble.com/ >> <http://friam.471366.n2.nabble.com/> >> FRIAM-COMIC http://friam-comic.blogspot.com/ >> <http://friam-comic.blogspot.com/> by Dr. Strangelove > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com > <http://redfish.com/mailman/listinfo/friam_redfish.com> > archives back to 2003: http://friam.471366.n2.nabble.com/ > <http://friam.471366.n2.nabble.com/> > FRIAM-COMIC http://friam-comic.blogspot.com/ > <http://friam-comic.blogspot.com/> by Dr. Strangelove > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com > <http://redfish.com/mailman/listinfo/friam_redfish.com> > archives back to 2003: http://friam.471366.n2.nabble.com/ > <http://friam.471366.n2.nabble.com/> > FRIAM-COMIC http://friam-comic.blogspot.com/ > <http://friam-comic.blogspot.com/> by Dr. Strangelove > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com > <http://redfish.com/mailman/listinfo/friam_redfish.com> > archives back to 2003: http://friam.471366.n2.nabble.com/ > <http://friam.471366.n2.nabble.com/> > FRIAM-COMIC http://friam-comic.blogspot.com/ > <http://friam-comic.blogspot.com/> by Dr. Strangelove
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