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Consumption of reagents used in flotation
Sept., 1926.]
U.S.
BUREAU OF MINES NOTES.
389
were obtained which will serve as a basis for explaining differences in leakage rates from covered and uncovered lines, in so-called " breathing losses " in pipe lines carrying gasoline, and in correcting apparent errors in measurements of natural gas. While the tests were conducted only in one district, the data indicate the general effects of temperature variations in other parts of the country. Further study is needed to establish the exact depth of cover required to offset undesirable fluctuations of temperature under different conditions. CONSUMPTION
OF R E A G E N T S U S E D I N F L O T A T I O N . By Thos. Varley.
DATA were assembled on the consumption of reagents used in metallurgical plants treating minerals by flotation, during the year 1925 . The bureau's figures show that flotation practice is being developed rapidly and on a more scientific basis than ever before. The total quantity reported of ore milled in 1925, including miscellaneous non-metallic materials, was 59,37 o,I 77 tons, and most of this ore was put through flotation plants, the amount so treated being 45,490,331 tons. The Bureau of Mines is closely co/Sperating with the operators, and is following a well-laid-out program of research on the fundamental principles of flotation. The data gained in the laboratory work are applied by technical research men in commercial plants, and the direct results obtained have been of material benefit to the industry in many ways. N e w Abstract Journal.--Biological Abstracts is announced as " a comprehensive abstracting and, indexing journal of the world's literature in theoretical and applied biology exclusive of clinical medicine." It succeeds both Abstracts of Bacteriology and Botanical Abstracts. In addition to the various divisions of botany and zoology, sections are also devoted to such subjects as paleontology, biochemistry, biophysics, pharmacology, immunology, insecticides and insecticidal apparatus, and applied microbiology. The new abstract journal begins its work with the literature of 1926. Twelve monthly issues and an index number will constitute a volume coinciding with the calendar year. Published under, the auspices of The Union of American Biological Societies, the new journal has its editorial omee at the University of Pennsylvania. J.S.H.
U.S.
BUREAU OF MINES NOTES.
389
were obtained which will serve as a basis for explaining differences in leakage rates from covered and uncovered lines, in so-called " breathing losses " in pipe lines carrying gasoline, and in correcting apparent errors in measurements of natural gas. While the tests were conducted only in one district, the data indicate the general effects of temperature variations in other parts of the country. Further study is needed to establish the exact depth of cover required to offset undesirable fluctuations of temperature under different conditions. CONSUMPTION
OF R E A G E N T S U S E D I N F L O T A T I O N . By Thos. Varley.
DATA were assembled on the consumption of reagents used in metallurgical plants treating minerals by flotation, during the year 1925 . The bureau's figures show that flotation practice is being developed rapidly and on a more scientific basis than ever before. The total quantity reported of ore milled in 1925, including miscellaneous non-metallic materials, was 59,37 o,I 77 tons, and most of this ore was put through flotation plants, the amount so treated being 45,490,331 tons. The Bureau of Mines is closely co/Sperating with the operators, and is following a well-laid-out program of research on the fundamental principles of flotation. The data gained in the laboratory work are applied by technical research men in commercial plants, and the direct results obtained have been of material benefit to the industry in many ways. N e w Abstract Journal.--Biological Abstracts is announced as " a comprehensive abstracting and, indexing journal of the world's literature in theoretical and applied biology exclusive of clinical medicine." It succeeds both Abstracts of Bacteriology and Botanical Abstracts. In addition to the various divisions of botany and zoology, sections are also devoted to such subjects as paleontology, biochemistry, biophysics, pharmacology, immunology, insecticides and insecticidal apparatus, and applied microbiology. The new abstract journal begins its work with the literature of 1926. Twelve monthly issues and an index number will constitute a volume coinciding with the calendar year. Published under, the auspices of The Union of American Biological Societies, the new journal has its editorial omee at the University of Pennsylvania. J.S.H.