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Re: Vs: How to produce cheap mirrors?

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Posted by Roger Gathright on June 24, 2003, 9:01 pm
 
Gee, what's wrong with aluminum flashing polished to a "Mirror" finish and
formed around a wood frame to give it the curve (cylinder radius) you want.
It works for me.  But I only use it to distill Alcohol!



Posted by Raleigh Myers on June 28, 2003, 4:29 pm
 
Raleigh Myers
ramyers@igc.org

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Check out off axis parabola
http://raenergy.igc.org/offaxis.html

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frequency

touching

infrared


Posted by Duane C. Johnson on June 28, 2003, 7:28 pm
 Hi Raleigh;

Nice to see your web page up again.


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Posted by Tim Lacy on March 28, 2005, 7:41 am
 Mylar film on the support surface of your choice.

I believe a search will reveal Nick's method of building a Very Big Parabola
using 2x4's and mylar.  Use grease to 'glue' the mylar to the forms... I'm
sure it's in the archives somewhere, or search
http://www.ece.villanova.edu/~nick/usenet/

Mylar is a great reflector, and it's cheap.





Posted by Brian Sanderson on March 30, 2005, 3:39 am
 Go ya one better...

Find yerself an airtight cylinder.  (the originator of this idea suggested a
"plug" used as part of the packing for commercial jet engines; it's a
shallow, wide cylinder, open at one end - abt. 3 ft+ diameter...)  Stretch a
mylar sheet across the open end and fasten it to the rim.  Attach a vacuum
fitting to the backside and draw out some air from the interior space.  If
it is sufficiently flexible (and you achieve an airtight seal), the mylar
will form a concave surface - in fact, a perfect concave mirror...

...idea originally inspired by a sheet of cellophane covering a glass bowl,
taken out of the microwave...

PS: I realise there are several practical problems with this idea, it's not
perfect, but it /might/ be worth an experimental try...?



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