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Trdufltrial Hygiene Digest - 37 August. 1949 954 Control of Cupola 8tack Emissions. J.F. Drake and T0. Kennard. Iron Age l6T, B8-92 (Apr. 7, 1949).' An Installation Is described Involving a closed charging bell, a dry dust collector and a vet vasher, vhlch results In Btack emissions vlthln the limits set by Los Angeles County air pollution regulations. Data are given an the nature of matter collected by this system. 955 Musgrave "Aerodynamic" Dust Collector. Anon. IndT Heat. Kngr. 10, 10tt-109 (Sept. 1946). Messrs. Musgrave A Co., Ltd, have acquired the manufacturing and selling rights for this nev collector (Byeteme Llnderoth), vhlch Is based on a nev principle of separation, and Is designed to overcome difficulties Inherent In the normal type of centrifugal collector, lie filter surface consists of a specially slotted sheet bent Into the form of a cone. Hie air or gas to be cleaned Is passed at high velocity over this surface, and due to the form of the slots,aerodynamic forces are set up, the resultant force on the dust particles being in a direction avay from the cone face. Hiis force keeps the dust particles suspended In the form of a thin cloud layer Immediately In front of the filter surface, vhlle the clean air escapes through the slots. These slots or passages far the clean air are many thousand times larger than the dust particles vhlch are removed, so that even vlth adhesive dusts there Is little tendency for the filter to become clogged. -- Atm. Poll. Bull. 936 Is It True that Silicosis Is Hot Progressive In the Absence of Tuberculosis7 J.L. Nlcod. Presse Med. 51ff. (Jan. U, 1949). Bicod does not agree vlth the conclusions of the conference on pneuno- nocanlosls held In London In April, 1947, vhlch asserted that pneumonoconl- 08Is can be arrested spontaneously by the cessation of exposure to dust except far those cases In vhlch silicosis Is combined vlth tuberculosis. He performed necropsies on 150 miners vho had been employed In the Svlss Alps and vho had died from silicosis. Neither recent nor old tuberculous lesions could be demonstrated on microscopic examination of 35 to 4o per cent of these 130 men vho had been vorklng as miners only temporarily, in some cases not longer than one year, and vho died from silicosis tvelve to twenty-three years after having discontinued work In the silica dust en vironment. Hie postmortem examination revealed the progressive course of the silicosis In the pulmonary tissues and In the lymph nodes In the ab sence of any tuberculous process. In cases In vhlch silicosis was combined vlth tuberculosis, the latter nearly alvays developed after the silicotic lesions In the lungs, and frequently it had an acute and terminal course. Tuberculosis Is a late cduplication of the pneumonoconlosls In the great majority of silicotic patients. -- J.A.M.A. 537 Dust Control In Machine Shops. Anon. Industrial Votes. Bureau of Ships, Havy Dept. Ho. 91. 12pp. (April 22, 1949). Conscious of the dally requirements of proper dust control, technicians are stressing constantly the Importance of using effective dust-collecting