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Solar concentrator from old satellite dish

Solar concentrator from old satellite dish

Made from an ordinary fiberglass satellite dish, it is covered in about 5800 3/8″ (~1cm) mirror tiles. When properly aligned, it can generate a spot the size of a dime with an intensity of 5000 times normal daylight. This intensity of light is more than enough to melt steel, vaporize aluminum, boil concrete, turn dirt into lava, and obliterate any organic material in an instant. It stands at 5’9″ and is 42″ across.

How-To: Earthbag dome

How-To: Earthbag dome

Owen Geiger on Instructables writes: This earthbag dome Instructable simplifies the process and illustrates each step of construction with photos. The two critical drawings are also included here. Please refer to the complete article before asking questions. This multi-purpose dome can serve as a storage shed or cool pantry above ground, or as a rootcellar […]