The Solar Funnel Cooker
How to Make and Use The BYU Solar Cooker/Cooler
http://www.solarcooking.org/plans/funnel.htm
by Steven E. Jones, Professor of Physics at Brigham Young University (BYU), with Colter Paulson, Jason Chesley, Jacob Fugal, Derek Hullinger, Jamie Winterton, Jeannette Lawler, and Seth, David, Nathan, and Danelle Jones.
Introduction