Ontario Sessional Papers, 1897, . air as carefully as possible until the charcoal is quitecooled, and is ready to draw. The fire must never burn too fast; the slower theprocess, if the fire is steady and regular, the better the yield of charcoal. Hardclose-grained woods take a longer time to coal than soft open-grained woods, andshould be placed in the heap accordingly. These technical instructions, handeddown in the forest for ages as secrets from father to son amongst the coalliers in every country in Europe, are the results of long practical experience, andstrictly accord with the
Ontario Sessional Papers, 1897, . air as carefully as possible until the charcoal is quitecooled, and is ready to draw. The fire must never burn too fast; the slower theprocess, if the fire is steady and regular, the better the yield of charcoal. Hardclose-grained woods take a longer time to coal than soft open-grained woods, andshould be placed in the heap accordingly. These technical instructions, handeddown in the forest for ages as secrets from father to son amongst the coalliers in every country in Europe, are the results of long practical experience, andstrictly accord with the true principles on which the process is based 42 60 Victoria Sessional Papers (No. ^j6). A. 1897 Several methods are adopted in Europe for the preparation of ch arcoal. Tocarbonize wood under a raovtxble covering, whereby the burner is able to regulatethe supply of air, the wood is arranged either in horizontal layers (Fig. 1), or innearly vertical ones, with a sliglit slope, so as to form conical rounded heaps ofdifferent sizes (Fig. 2)..
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