Make a Solar Parabolic Trough Cooker/Concentrator (from scratch). Easy DIY. full instructions. video shows How To: draw the parabola, design the frame, shape the parts and assemble the items. the only materials needed are cardboard or wood (or other suitable building materials), glue, and shiny foil. cost of materials: $1.50 for each box (uses 2 large 18" x 18" x 24" boxes) from home depot or lowes, $1.00 for the glue and $1.00 for the foil. Total cost $5.00. compact and durable. 300F+

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