Document 6w9r6o7VK4MJ01n70ermmXzo1

Industrial Byglene.Digest - 33 Industrial Dusts * January, 1950 105 Dust Control1 In the Ceramic Industry. W.C.L; Hemean. Am. Ceram. Boo. Bull. 28, 94-97 (Mar. 15, 1949). Hie author first discusses dust control especially In relation to plant expansion and modernization. Then the separate operations--rav materials handling, overhead bins, etc., weighing and charging--are considered separately with their problems. The addition of a small amount of water to flint dust Is recommended far box car shipments, and for weighing and charging as being.better than exhaust ventilation, shipping ` In baga, or other methods that have been advocated. The dust may present a silicosis hazard or a nuisance value. The farmer must be eliminated vith the least delay, but the time can be taken to eliminate nuisance dust. Measuring the silicosis hazard Includes .dust counting, free silica determina tion, and1 x-ray examination of employees. A table shows the relative toxicity, dustiness, and toxicity times dustiness. In the glass, silica brick, clay brick, and pottery Industries. The economics of dust control Is then discussed briefly, showing bow the lav of diminishing returns operates when unnecessary steps are taken to insure complete dust removal. 106 Respiratory Disease: An Industrial Hazard. A.T. Doig. ' Glasgow Mod. J. J>0, p. 235 (July, 1949)." The author reviews the present status of knowledge of the respiratory disorders caused by Industrial dusts, pointing out that dusts encountered In Industry may produce a wide variety of reactions in the respiratory tract. -- Condensed from Arch. Ind. Hyg. & Oc'c. Med. 107 Some Changes In the Blood in 8Hlcosls. S.M. Geukin, .1. Gelfan, : N. Mlglna, A. Rasheyskaya and A. Shilova. Kiln Med. Mosk. 26,' p, 49(1948) Russian. The authors found that certain blood changes may ocour early In sili cosis. The raised erythrocyte sedimentation rate found In a high percentage of cases of early silicosis Is explained by the presence of secondary Infection, bronchitis, pleurisy, and Blight toxemia which are known to occur, even In the early stages. The viscosity of the blood was studied In 249 cases. It was over four In 45 per cent of controls. In 37 per cent..of ..those exposed to dust* In 50 per cent of stage-1 Cases, In 70. ' per. cent of stage-2 cases fend In 91 per cent of stage-3 cases. The same Investigations vith a group of patients free from tuberculosis, but with silicosis gave the same results. The quotient of Hesse, (hemoglobin percentage) ^ xover than 17.8 (normal) even in early cases viscosity of the blood of silicosis. The rise In the blood viscosity was thought to be due to a rise In the mean corpuscular volume of the erythrocytes of up to 92.2 cubic microns, -found to Occur In a group Of l60 cases of. slllcbsls. The possible causes of a'rlse'ln mean corpuscular volume are discussed.- Ex periments In vitro showed that the addition of silicon dioxide to whole