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This can purify water, immediately begin a fireplace, soften steel, cook dinner things to eat and even soften concrete…..This can soften a padlock for those who wanted to get in someplace too … simply saying.
This is constituted of a easy lens known as a Fresnel lens… These are generally present in previous rear projection large display TVs ….
WHAT IS A FRESNEL LENS – The fundamental concept behind a Fresnel lens is straightforward. Imagine taking a plastic magnifying glass lens and slicing it into 100 concentric rings (just like the rings of a tree). Each ring is barely thinner than the subsequent and focuses the sunshine towards the middle. Now take every ring, modify it in order that it’s flat on one aspect, and make it the identical thickness because the others. To retain the rings’ capability to focus the sunshine towards the middle, the angle of every ring’s angled face might be completely different. Now for those who stack all of the rings again collectively, you’ve gotten a Fresnel lens. You could make the lens extraordinarily giant for those who like. Large Fresnel lenses are sometimes used as photo voltaic concentrators.
Bonus: Root Cellar That Can Be Used as a Bunker
Do you bear in mind the old root cellars our great-grandparents used to have? In reality, they in all probability constructed it themselves, proper of their again yard.
If you wish to discover ways to construct a yard bunker like your grandparents had, with out breaking the financial institution, you then want Easy Cellar.
Easy Cellar will show you:
- How to decide on the best web site
- Cost-effective constructing strategies
- How to guard your bunker from nuclear blast and fallout
- How to hide your bunker
- Affordable fundamental life assist choices
Easy Cellar may also reveal how a veteran, with solely $421, constructed a small nuclear bunker in his yard.