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OF PAPER Reference is made to propaganda against processes for making nitrates from air by those interested in keeping the Allies dependant on supplies of nitrate from Chili. A tabular comparison is made of the operations involved in the indirect method and the direct method of fixing nitrogen. The indirect method involves the manufacture of carbide of calcium and its combination with nitrogen to form calcium cyanimid, from which ammonia and in turn nitric acid are obtained. The direct methoddoi:10.1109/t-aiee.1918.4765567 fatcat:xqdqzpxymzgmxgsi4s5q7yujtu