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In the past two or three months an article on "The Direct Production of Pure Heat from Coal," taken from an English journal, has been extensively noticed and copied in the newspapers of this country. While there may be some valuable features in the system described, some of the statements are sufficiently extraordinary to deserve comment, if not severe criticism or unbelief. It seems that a Mr. W. A. Gibbs was called upon by some India tea planters to devise a method by which pure hot air, suitable for drying tea, could be obtained from waste wood or coal. The apparatus made by him, and which, it is claimed, fulfils all the requirements, consists of a brick chamber 5×2×2, built upon the ground, with a feed and a fuel chamber at one end and a powerful fan at the other. Between the chamber and the fan are baffle plates, splitting
PURE HEAT FROM COAL.. JAMA. 1888;XI(7):239-240. doi:10.1001/jama.1888.02400590023005