第66章知识
coal would be transformed into carbonic acid, then into oxide of carbon, its use being to reduce the oxide of iron, that is to say, to rid it of the oxygen.
thus the engineer proceeded. the bellows of sealskin, furnished at its extremity with a nozzle of clay, which had been previously fabricated in the pottery kiln, was established near the heap of ore. using the mechanism which consisted of a frame, cords of fiber and counterpoise, he threw into the mass an abundance of air, which by ra
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