fresnel lens

[Antonin]

Here is an interesting use of a fresnel lens to produce potable water
with concentrated sunlight.

http://www.youtube.com/watch?v=aXjMAItCMl0&feature=PlayList&p=AA3631564D1195A3&playnext=1&playnext_from=PL&index=46

[Mark Ireton]

Hi Antonin,

Due to some spam, I am not moderating messages to the Group.  So there will be some delay after posting your message.  Maybe I can change the settings so that members can post without moderation.

That was a really cool video.  It seems like the fresnel lens could also be useful for cooking.  I wonder how difficult it would be to build a lens out of easy to obtain materials.  I have seen fresnel lens at lighthouses and the look like multiple layers of glass.

Mark

[Antonin]

Hi Mark,

I think that making a homemade fresnel lens would be difficult. A
parabolic mirror might be easyer to make, from old CDs or pieces of
broken mirrors.

On 28 fév, 10:44, Mark Ireton <m...@iretonfamily.com> wrote:
> Hi Antonin,
>
> Due to some spam, I am not moderating messages to the Group.  So there will
> be some delay after posting your message.  Maybe I can change the settings
> so that members can post without moderation.
>
> That was a really cool video.  It seems like the fresnel lens could also be
> useful for cooking.  I wonder how difficult it would be to build a lens out
> of easy to obtain materials.  I have seen fresnel lens at lighthouses and
> the look like multiple layers of glass.
>
> Mark
>

> On Sat, Feb 27, 2010 at 1:42 PM, Antonin <antonin.paq...@usherbrooke.ca>wrote:
>
> > Here is an interesting use of a fresnel lens to produce potable water
> > with concentrated sunlight.
>

> >http://www.youtube.com/watch?v=aXjMAItCMl0&feature=PlayList&p=AA36315...