RE: DIY - taking a fresnel lens from an old TV
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Actually fascinating. I often see an old TV on the side of the road.
Aligning a few together into an array, offers some interesting cooking and water purifying possibilities. Smelting would take a few more, I expect.
Even a kiln, to fire clay creations. Off to youtube I go :)
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Lots of possibilities but unfortunately you can't focus one into another. It would be great if you could. It's got to be a rear projection TV. not one with a tube or LCD screen.
I use it to focus some extra heat onto a box type solar oven or old style enamel kettle