Document XOqdM2K6MJmEx0QDQ1nR4ZmrK

Industrial Hygiene Digest - 29 August , 1949 standard vill be considered unreasonable by Industry, and may farce plants to leave the area. Another difficulty lies In the small quantities of substances that are to be detected. Intermittent pollution raises a diffi cult problem in sampling. 906 Bronchopneumonia and the Production of Ferromangemeee. P. Povolerl. Med, d. lavoro W, 55 (1947) Italian. The paper is concerned vith the relation betveen the number of tons of ferromanganese produced and the Incidence of bronchopneumonia in Aoeta, Italy.' Par four years there vas a direct relatlcm betveen these two . factors. Then followed three years In which the production of ferroman ganese vas further stepped up, but the number of cases of the disease de creased markedly. The author thinks that the Introduction of sulfanamides and perhaps becoming accustomed to the fumes diminished the figures. He also' believes that other factors should be studied before definite con clusions can be reached. -- J. Ind. Hyg. A Toz. 909 Plamnablllty of Methyl Alcohol Vapor-Air Mixtures at Lov Pressures. O.W. Jones and PJS. Scott. U.B. Bureau of Mines, Kept. Invest. Mo. W*73 5pp. (May, 1949). The results, mostly expressed In tables and charts, show that the lowest pressure at which methyl alcohol vapor In air propagates flame Is 50 mm, mercury absolute, or Just under 1 pound per sq. in., with spark Ignition, and at about half that pressure foilowing a guncotton explosion. 910 Inflammability Limits of Ammonia, Nitrous Oxide and Air. E. Jones and J.CwKerr. J. floe. Chem. ind. bo. 51-30 (Jan, 1949). Mixtures of ammonia and nitrous oxide are inflammable %&en the ammonia concentration is between 2.6 and 72$, without air, varying slightly with the direction of propagation. Addition of air causes contraction of the Inflammable range at both ends, roughly In proportion to the amount of air added. An Increase In cross-section or in temperature produces a slight widening of the limits. Mixtures of the three gases appear to obey Le Chateller's limit rule except for some discrepancy affecting lover limit mixtures. Nitrous oxide containing small amounts of ammonia also behaves abnormally, In that It Is likely .to explode violently, probably on account of the exothermic decomposition of nitrous oxide catalyzed by the ammonia. 911 Some Meteorological Aspects of Atmospheric Pollution. 0J4.B. Dobson, ijuart. J. Noy. Meteor. Boc. 74, 135-143 (April 1948). In this study of the Interplay of meteorological candltienc and the atmospheric pollution produced In cities by burning 01 coax, the speaker considered how smoke and other polluting matter are removed from town air and how the rate of removal depends on meteorological conditions. He re viewed the results of three years' observations on the atmosphere of Leicester undertaken by the Department of Scientific and Industrial Besearch and described In "Atmospheric Pollution In Leicester-- A Scientific Survey".