“If a small magnifying glass will burn things with sunlight, how much power could you get from a lens as big as you?” So begins the following video. Right now people all over the country are getting flat screen TVs and selling their old rear projection TVs. Many people are giving them away for free.
Rear projection TVs have several useful items inside, but the best one is the large Fresnel lens, which is basically a giant magnifying glass. On a sunny day, you can generate an incredible amount of heat with one of these. Watch the video below to see what I’m talking about and learn how to get your own.