HEAT RETENTIVE PLATE PATENT DRAWING http://doiop.com/patente explains everything. simpler configurations are possible, I will post photos of different phases of the invention, not necesarily in chronological order.
now that I see my album I find that many of my Ideas are funny. there is one photo with a lot of smoke in it. (If there is no smoke, there is no good research, like there is no party until something is broken or it ain't over till the fat lady sings).