Melting Rock With The Sun

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Using and fresnel lens and a swivel frame I and able to instantly catch wood on fire, melt rock, dirt and metal. Also shown here is a focus tube. While not completely needed, it is hard to guess the positioning when using something this large. Commonly seen, using a small magnifying glass, You get a V-shape curve of light if off angle to the sun instead of a spot which spreads the heat over a larger area. With a large fresnel lens you can already see that a lot of light is scattered around the main spot. So by using this it makes it quick to set up and reduces the light scatter as much a possible.

Видео Melting Rock With The Sun канала Growing Answers