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 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
505-453-4944 (cell) http://www.cs.unm.edu/~angel
On Jan 30, 2019, at 5:15 AM, Tom Johnson <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
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