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Show Tanbark As a Fuel. Perhaps the most important of waste fuels in the United States has been spent tanbark. A rough estimate would indicate that this material generated gen-erated a few years ago an amount of steam that would have otherwise required re-quired the yearly consumption of about 2,000,000 tons of high grade coal. Yet this valuable fuel was at one time considered a mere detriment and an expense to the leather industry. It was disposed of by lumping It into rivers, filling in waste ground and by making roads with it, often necessitating necessitat-ing the paying out of 'a'rg ums for its disposition. This w-inxxy illustrates illus-trates a case of how the improvement of a furnace converted a hitherto supposed sup-posed combustible into a valuable waste fuel of the auto-combustible class, and shows how an enormous waste was converted into an equally great economy. Engineering Magazine. |