When I was a young’n there was a mail-order company called Edmund Scientific Corporation. They sold fresnel lenses as well as a bunch of other cool stuff like prisms and optical equipment for geeky kids like me.
In the General/Chat forum, on a thread titled DIYer removes screen from TV to create death ray laser, COBOL2Java wrote:
When I was a young’n there was a mail-order company called Edmund Scientific Corporation. They sold fresnel lenses as well as a bunch of other cool stuff like prisms and optical equipment for geeky kids like me.
Years back I also ordered along with a couple of freznel lens their solar tracker which you could track the sun from them. Hope finally to set it up for my water heater hooked to a circulating pump to fill my 40 gal hot watertank. One of these daze maybe.