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Optical rotation and atomic dimension. VI
NOTES
F R O M T H E U. S. B U R E A U
OF MINES.*
AN X-RAY STUDY OF LIMES OF DIFFERENT PLASTICITY. By Marie Farnsworth.
WORK was completed on an X-ray study of limes made by burning marble and precipitated calcium carbonate in air at 1800 ° , 2000 ° and 2200 ° V., and marble in a vacuum furnace at 1200 ° to 2400 ° F., in steps of 200 °. The plasticity of all the samples was measured and X-ray powder photographs taken. It was found that the lines of the pattern differ for samples of different plasticities, and thereby furnish an index of the plasticity. The object of the work was to determine whether additional information could be obtained b y this method, that would help to explain differences of plasticity shown by limes from limestones of the same chemical composition. Details are given in a paper presented to the Journal of Industrial and Engineering Chemistry. ALKALI CYANIDES IN THE IRON BLAST-FURNACE. By S. P. Kinney and E. W. Guernsey.
FOR a number of years the Bureau of Mines has been studying the physical and chemical reactions that take place during the smelting of iron in the blast-furnace. It has made experiments in the laboratories of the experiment stations at Pittsburgh, Penna., and Minneapolis, Minn., has made test runs with an experimental blast-furnace at Minneapolis, and has collected a large mass of data on the work done by commercial blast-furnaces. The presence of alkali cyanides in the interior of the iron blast-furnace has been noted repeatedly during a period of almost IOO years, and has been studied more or less closely by a few persons. In order to establish more definitely the alkali-cyanide concentration in the gases from various regions of the modern blastfurnace, the Bureau of Mines, in co6peration with the Fixed Nitrogen Laboratory, undertook an investigation in 1924 in conjunction with a more general study of the fundamental reactions * Communicated by the Director. 823
F R O M T H E U. S. B U R E A U
OF MINES.*
AN X-RAY STUDY OF LIMES OF DIFFERENT PLASTICITY. By Marie Farnsworth.
WORK was completed on an X-ray study of limes made by burning marble and precipitated calcium carbonate in air at 1800 ° , 2000 ° and 2200 ° V., and marble in a vacuum furnace at 1200 ° to 2400 ° F., in steps of 200 °. The plasticity of all the samples was measured and X-ray powder photographs taken. It was found that the lines of the pattern differ for samples of different plasticities, and thereby furnish an index of the plasticity. The object of the work was to determine whether additional information could be obtained b y this method, that would help to explain differences of plasticity shown by limes from limestones of the same chemical composition. Details are given in a paper presented to the Journal of Industrial and Engineering Chemistry. ALKALI CYANIDES IN THE IRON BLAST-FURNACE. By S. P. Kinney and E. W. Guernsey.
FOR a number of years the Bureau of Mines has been studying the physical and chemical reactions that take place during the smelting of iron in the blast-furnace. It has made experiments in the laboratories of the experiment stations at Pittsburgh, Penna., and Minneapolis, Minn., has made test runs with an experimental blast-furnace at Minneapolis, and has collected a large mass of data on the work done by commercial blast-furnaces. The presence of alkali cyanides in the interior of the iron blast-furnace has been noted repeatedly during a period of almost IOO years, and has been studied more or less closely by a few persons. In order to establish more definitely the alkali-cyanide concentration in the gases from various regions of the modern blastfurnace, the Bureau of Mines, in co6peration with the Fixed Nitrogen Laboratory, undertook an investigation in 1924 in conjunction with a more general study of the fundamental reactions * Communicated by the Director. 823