Typical inverted downdraft gasifier run, No. 5, p. 92, Book
II, showing initial stable combustion at 12 g/min, pan on at 11 min, water boiling at 19 min, primary air turned to 20% for simmering at 20 min, and a yield of 150 g charcoal

see: http://www.bioenergylists.org/node/2559
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Details of one type of air valve for coarse and fine control
of primary air. We have also constructed very satisfactory stoves from
tin cans with riser sleeve liners. Use of the outer can permits addition
of simple handles to the gasifier and burner sections.

see: http://www.bioenergylists.org/node/2559

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A WOOD-GAS STOVE FOR DEVELOPING COUNTRIES
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