Re: [ATM] Subject: light weight mirrors--mylar!

[Peter De Baan <pdebaan@hotmail.com>]

Just 2 cents: on valley adjacent to Lake Henchaw just east
of Mount Palomar was a solar electric power collector which
used mylar mirrors (the mylar stretched over a bowl air-thigth
and each one vacuem sucked to the right focal length) each 
of the assembly was some where of 5 feet or larger diameter 
and about 100 units where feeding solar heat onto a pole 
mounted vessel with oil which would heat a steam powered 
generator,
 
Peter     > Date: Sat, 10 Nov 2007 23:46:15 -0800> From: smithersscope@yahoo.com> To: richard1941@gmail.com; atm@atmlist.net> Subject: Re: [ATM] Subject: light weight mirrors--mylar!> > Yeah, just use mylar (from one of those "over 40" or> some such balloons) and you won't even have to have it> coated!> > Spent the day with a friend from work piddling in the> garage; almost finished the binoc mounts (tripods and> parallelograms for his 10x70's). He had to head home> right after dinner. Shame...First night in weeks we've> had clear skies here on SoCal...finally got to see> Holmes through my 16" scope. Wow! The sucker barely> fits in the FOV with my 52mm Rini!! Too cool. Had the> kids hootin' and hollerin'.> > Dave> > > --- Richard Schwartz <richard1941@gmail.com> wrote:> > > If you really want a thin mirror challenge, why not> > make the mirror out of> > 1/4" plate glass, or better yet, saran wrap? If> > you work the flotation> > cell right, you might not have to grind or polish> > anything; just bend the> > mirror to the correct shape!> > > > If you think I am kidding, I have actually done> > this. But it was a solar> > cooker, not a telescope.> > > > . . . Richard> > > > > > -----Original Message-----> > From: atm-bounces@atmlist.net> > [mailto:atm-bounces@atmlist.net] On Behalf Of> > horace r davis> > Sent: Saturday, November 10, 2007 7:00 PM> > To: atm@atmlist.net> > Subject: [ATM] light weight mirrors> > > > I am looking for people that would like to share> > information on> > developing new low cost large light weight mirrors> > My idea is 1 inch front thickness for 20 inch dia> > with a ribs 2 inch> > high but must line up with flotation cell. 1.25 > > inch thick for 24 inch> > dia with a ribs 2.5 inch high and 1.5 inch thick for> > 32 inch dia with a> > ribs 3 inch high. It looks like the glass will need> > to be fused to the> > ribs from the information I have got from the ATM> > sits. The cost of> > mirrors and weight of telescopes is hampering the> > number of large scopes> > in the ATM world we can change that.> > > > Ribs may not be necessary. I've seen 30" mirrors of> > 1" plate on the web and> > heard of a 32" out of 1" plate. Compared to these a> > 20" wouldn't be tooo> > hard.> > > > Mitch> > _______________________________________________> > ATM mailing list http://www.atmlist.net/> > > > > __________________________________________________> Do You Yahoo!?> Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > _______________________________________________> ATM mailing list http://www.atmlist.net/
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