. Annual report of the Board of Regents of the Smithsonian Institution . produce amixed acid containing little water, the use of refrigerated water tocool the acids, the displacement of the nitroglycerin by means ofwaste acid, which obviated the remixing of acid and nitroglycerinon emptying the nitrator, and the addition of water to stop theseparation of further quantities of nitroglycerin, was that theytogether contributed to yield much better results. As a matter offact in well-conducted works the yield of nitroglycerin with theproportions of to 1 mentioned above was between 217 and 220
. Annual report of the Board of Regents of the Smithsonian Institution . produce amixed acid containing little water, the use of refrigerated water tocool the acids, the displacement of the nitroglycerin by means ofwaste acid, which obviated the remixing of acid and nitroglycerinon emptying the nitrator, and the addition of water to stop theseparation of further quantities of nitroglycerin, was that theytogether contributed to yield much better results. As a matter offact in well-conducted works the yield of nitroglycerin with theproportions of to 1 mentioned above was between 217 and 220;at Waltham Abbey it was possible to obtain by the displacementprocess a yield of 229 parts nitroglycerin for 100 parts glycerin,instead of the former 220 parts. According to Mr. de Mosenthal theNobel works obtained similar good results. This yield has to theauthors knowledge been only once exceeded in a Belgian factory,when a charge of nitroglycerin had to be drowned on a cold winters a British patent No. 20310, of 1D05. Smithsonian Report, 1908.—Guttmann. Plate NiTRATOR Separator (Nathan, Thomson, and Rintouls Patenti Smithsonian Report, 1908.—Gultmann. Plate 2.
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