speaking of homemade furnaces
back in my misspent youth ,we used to do "kerosene hangi's
a piece of exhaust pipe about 2 meters long with a piece of brake pipe let into the side of it about halfway along,brake hose pushed onto that syphoning
from the kero can at a steady drip,vacuum on blow at one end of exhaust pipe,other end into the side near the bottom of a 12 gallon drum full of brake blocks and hooks from trains.
light a fire with newspaper in bottom of drum to get things going.
In about 15-20 minutes contents of the drum would be just about white hot,push it over into the hole,plenty hot enough to cook a fair sized hangi in about 3 hours.
no photographic evidence was collected at the time
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