We studied this when I was in grade school in the 70's. We did an experiment where we put a popsicle stick in a test tube, corked it with a cork with a glass tube it it. When we heated the tube the gas would come out the tube and we got a flame like a bic lighter. Was very interesting. I don't see how they gain the efficiency tho, you need to heat the wood then pull the gas for other uses. I suppose you could use the wood to heat a boiler for house heat, then have a separate compartment to heat wood to get gas for other uses as well, like a propane type water heater or cook stove. When all the gas is out of the wood all you have left is ash just like if you burned it. You can actually watch the process by just watching a fire close. You will see that the flame never touches the wood, it just heats it causing the gas to escape and then the gas burns.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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