. American engineer and railroad journal . oke from locomo-tives in tunnels, which has recently been patented in England byMr. C. Anderson, of Leeds. The object of the invention is thepurification of the atmosphere in underground railroads andtunnels by diverting the products of combusion given off fromthe locomotive, and carrying them through a communicatingpipe to a fiue in the permanent vay. From this flue they areextracted in any suitable manner. Referring to the illustra- provided for preventing cinders from finding their way into thepipe C. The sliding-box G, of considerable length, is
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