After a quick look around I decided on one of the projects he would have certainly vetoed when I was a kid. A solar furnace built from the lens of an overhead projector.
Having recently been to a Maker Faire and greatly impressed with the open source building system called Grid Beam I decided to incorporate it into this project.
Step 1: Gather Materials
- A sunny day. I found mine in Southern Colorado in June. 100F in the shade. Plenty of sun.
- The Fresnel lens out of an overhead projector or back of an RV or other source.
- Some wood. 4 to 6 feet of 1.5" or 2.0" square stock is ideal. (In reality mine was 1 2/8ths square)
- A drill or drill press with a 5/8ths bit.
- Six to Ten 1/4" carriage bolts and nuts. The bolts should be 1/4"-1/2" longer than twice the width of the square stock.
- A socket or wrench for the bolts.
- Some bricks are nice to have. Firebricks if you have them.