Scientific American Supplement, No. 415, December 15, 1883

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To 0. 60 m. Apart vertically, and from 0. 80 m. To0. 90 m. Apart horizontally. The lower vents start on the second row ofthe brickwork above the foundation, and are placed on the level with thefloor, so that the fire can draw to the bottom. There is sometimes anadditional opening near the top to allow of the rapid escape of thesmoke and gas at the time of firing, which is then closed, and keptclosed until the kiln is discharged. This applies mostly to the besttypes of conical kilns. In the circ...ular and conical ones the topcharging door is sometimes used for this purpose. Hard and soft woodsare burned indifferently in the kilns. Hard-wood coal weighs more thansoft, and the hard variety of charcoal is usually preferred for blastfurnaces, and for such purposes there is an advantage of fully 33-1/3per cent. Or even more in using hard woods. For the direct process inthe bloomaries, soft-wood charcoal is preferred. It is found that it isnot usually advantageous to build kilns of over 160 to 180 cubic metersin capacity.

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