Last week went to a local metal working club and they had a presentation using a DIY oil furnace for backyard casting. They indicated the design had been around for some time but didn't get an further information. Was really simple, visualize 2 freon cans joined with a horizontal pipe. Air was blown in to the first can, fuel (kerosene or used engine oil) was dripped into this air stream using an elevated tank and needle valve. Mixture was blown into the first can which had been preheated much the same as an old blow torch. The mixture then ignited and blew into the second can which held the melting pot. Did a search here and on google but didn't find anything, any ideas?