[FRIAM] Photos of popped balloon

[Barry MacKichan]

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 <angel at 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)   angel at cs.unm.edu
>> 505-453-4944 (cell)  http://www.cs.unm.edu/~angel
>>
>>
>>
>>
>> On Jan 30, 2019, at 5:15 AM, Tom Johnson <tom at 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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> ============================================================
> FRIAM Applied Complexity Group listserv
> Meets Fridays 9a-11:30 at cafe at St. John's College
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