Not sure why you would need two focal points like this just to start a fire using a large Fresnel lens, but I like the outside the box type of thinking involved…
Solar Fresnel Lens Array (video)
24 Dec
Prepare and defend against a disaster
Prepare and defend against a disaster
Not sure why you would need two focal points like this just to start a fire using a large Fresnel lens, but I like the outside the box type of thinking involved…
