Document M4GREJ1Ryv190jgXjwpdxpjMM

4 > h PLAINTIFF'S EXHIBIT Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING ! CHEMICAL 4 i i 1 i INDUSTRIAL HYGIENE FOUNDATION , MELLON INSTITUTE 4400 FIFTH AVENUE PITTSBURGH 13 PA. ii i ? FOUNDATION FACTS Foundation Facta la a monthly nawc-lattae la to Industrial concarno holding momhorahlp In Industrial Hyglana Foundation. Tho Foundation la a nonprofit association of Industries for tho advancement of healthful working conditions. 16 December, 1954 No. 12 DR. WEIDLEIN HONORED Edward R. Weidlein, President of Mellon Institute, is the recipient of the first Jonal Presidential Citation by the Air Pollution Control Association..__lUfeStward was *e in recognition of Dr. Weidlein1 a interest and dynamic 1 of air ution control since 1916. NEW FOUNDATION MEMBER ht companies have become members of Industrial Hygiene ter of the year. They are: e last Commonwealth Sanitation Company Mechanical Industries, Inc. Olin Mathieson Corporation Pilot Chemical Company Pittsburgh Steel Company Radio Corporation of America I. Li.Stiles &c Sons Brick Company Wyandotte Chemicals Corporation REPRINTS OF TECHNICAL LITERATURE AVAILABLE following reprints by Foundation staff members are available upon request: ~vironmental Medicine in Industry" by Dr. C. Richard Walmer, published in the June, issue of Public Health Reports. rrent Conceptions on Air Pollution" by W. C. L. Hemeon, presented at the Philadelphia gional Technical Meeting of American Iron and Steel Institute, October 6, 1954, and at San Francisco Regional Technical Meeting, November 5, 1954. 0 reprints on principles of industrial ventilation by W. C. L. Hemeon, entitled: "Exhaust t Hot Processes, " and "Theoretically Required Exhaust Rates for Dust Control in Bulk erial Handling Systems" . The papers are based on two chapters in the author's forth* ing book. Plant and Process Ventilation, which will be released by the Industrial Press January, 1955. reprint combining two papers on stack dust sampling by W.C.L.Hemeon and George F. ines, Jr. , entitled "The Magnitude of Errors in Stack Dust Sampling," and "A New tthod for Stack Dust Sampling." These papers were presented at the semi-annual meet of the American Society of Mechanical Engineers, held in Pittsburgh, Pa. , on June 22, 9514 and published in the November, 1954 issue of Air Repair. rinciples of New Plant Design for Health Protection" by Theodore Hatch. Reprinted m the Transactions of the Technical Conferences of the Eighteenth Annual Meeting of ustrial Hygiene Foundation. -jMTMAI. HVOIN POUNOATIOM 4400 FIFTH AVKNUI mTTItUNOH (tt).PA. 1 *'|54 ria)'Hygiene Digest December, 1954 ions on the surface irregularities produced by removal of alumina and other im- purities. The presence of these ions enables the silica surface to attract a greater number of hydroxyl ions from the solvent medium, with the subsequent formation of highly soluble silicic acid. -- Cond. from authors1 conclusions Physicochemical Studies on Dusts. 8. Some Sorption Properties of Siliceous Dusts.- ea J. G. Gibb and P. D. Ritchie. J. Appl. Chem. 4, 483-487 (Sept. 1954). Itlc. * * ( i I ill- t tic j vo 1 r ob.; Hon yalloi ?8 le sul ixturi Rock crystal, Lochaline sand, and vitreous silica (Vitreosil) dusts all show reduced affinity for a dyestuff cation on removal of the disturbed outer layer from the particle surfaces. This layer of amorphous silica is therefore more re active than the .underlying core in sorption processes, just as in solution processes. In the case of vitreous silica, there is probably a physical difference between the outer amorphous layer and the nominally amorphous core, such as a more open structure. Heat treatment and repeated acid extraction have the same effect in both sorption and solution experiments. Alteration of the surface is probably responsible in both cases. -- Cond. from authors1 conclusions The Effect of Quartz Dust and Aluminum Phosphate on Certain Enzymes. B. Helferich and Erika Schmitz. Beitr, Silikose-Forsch. No. 24, 1-20 (1953). German. sb do iepeel net- * This paper describes initial results on the inhibition of enzyme reactions by quartz dusts. It was found that potato phosphatase was adsorbed on quartz dust to an extent depending on the specific surface of the quartz, but that in the adsorb ed state the enzyme was still nearly 100% active. Aluminum phosphate and alum inum silicate also adsorbed the enzyme. A search for phosphatasein a fresh sample of silicotic lung tissue gave negative results. The work will be continued with other enzymes. -- Cond. from Bull. Hyg. ertiei i tone billti rtly Early Diagnosis of Asbestosis by Enlarged Radiographs. J. Krausler and R. Seyss. Z. Unfallmed. u. Berufskrankh. 47, 59>64 (Mar. 15, 1954). German. After a brief description of asbestosis and the changes in the lung tissue in the early stages, the authors describe a radiographic technique with a fine focus. Of 16 asbestos workers, with 1 to 18 year's exposure, eight showed Changes in the lung tissue with the enlargement technique; two of these showed no change by normal technique, and in the other six cases the degree of change shown was minimal. -- Cond. from Bull. Hyg. .e ndenl ter JOO in Pneumoconiosis in a Feldspar Worker. W. Rotter and H. Gartner. Zentralbl, Arbeitsmed. u. Arbeitsschutz 4, 35-40 (Mar. 1954). German. The authors describe a fatal case of lung disease in a feldspar worker, which they regard as modified silicosis. The dust contained 27. 1% potassium 1 31.