Scientific American 49, 29.7.1848
A mode of manufacturing this substance in France, is to fill all the interstices in the heap of wood to be charred, with dry powdered charcoal; then cover the whole mass with earth or sods, and burn it in the usual way. By this means, much of the access of air is prevented, and a saving of ten per cent in volume, as well as weight of charcoal, will be gained over the ordinary modes.
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