Solar roaster on top of grill
This link provides the instructions on building a solar marshmallow roaster. Read the whole page and look at the picture of what a large fresnel lens can do to pennies in 3-4 seconds.
Inside of Solar RoasterBuilt September 2010 - Louisville, KY
This can be accomplished with the following materials: fresnel lens magnifier (like this one at amazon.com), cardboard box, coat hanger, aluminum foil, glue and tape.
On a partly cloudy day, this roaster got a marshmallow to 160 degrees F. In future tests hopefully it will get hotter.
Update: BE CAREFUL WITH SOLAR COOKERS!This one was left unattended and when checked on it a hole had burnt into the cardboard on the side leaving the aluminum foil exposed.
On a partly cloudy day, this roaster got a marshmallow to 160 degrees F. In future tests hopefully it will get hotter.
Update: BE CAREFUL WITH SOLAR COOKERS!This one was left unattended and when checked on it a hole had burnt into the cardboard on the side leaving the aluminum foil exposed.
