Document X7G3eKbJYMJ3LejvZmOGK3G1J

.PLAINTIFF'S EXHIBIT NO. ADMITTED: t Industrial Hy tene INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL - TOXICOLOGICAL SEPTEMBER. 1950 (Vol, 14. No. 9) INDUSTRIAL HYGIENE FOUNDATION 4400 FIFTH AVENUE PITTSBURGH i3, PA.  ./ 4al Hvgiene Digest - lU Serte '3.052 Other Lung Diseases Due to Dust, A,T. Doig. Postgraduate hied, J. 25, Q59-Q-9 (Dec. 19^9) A review is given of the effects on the lungs of various dusts, nair.lv nixed dusts. These often contain a proportion of silica and it is questioned vhether their effect can be attributed to it. Among these dusts are those derived iron carborundum, aluminum, graphite, iron,' tin, manganese oxide, and beryllium. The node of action of vegetable dusts is obscure, although a variety of pneumoconioses have been attributed to them. -- Condensed from Bull. Zyg. 1C55 Asbestosis. a. Vyers. Postgraduate Med. <J. 25, cpl-058 (Dec, 19^9). Asbestos and talc are the only two silicates which have been shovn to produce pneumoconiosis. Gardner, in 1958, suggested, on the basis of animal experiments that the effect produced by asbestos vas mechanical, since it vas produced only by long fibers. A later authority made the observation that workers exposed to very short-fiber asbestos were not affected by it. As bestos is was officially recognized as an industrial disease in 1950. Tns condition is thought to be due to blocking of the finer bronchioles by long fibers which seem to irritate the bronchial wall and cause fibrosis. Tubercu losis and carcinoma of the lungs may followsas complications. Beccgniticn of the disease, and precautions which have been taken have lessened its severity and incidence. -- Condensed from Bull. Zyg. 105- A Review of Dust-Allayir.c Practices at Vcrkinsr Paces in Some Bituminous Coal and lignite Mines. J.J. Pcrbes, P.,1. Franklin S.T. Beese. U.S. Bur. Mines Inf. Circ. 75-5 29?p (May 1950). Data on cust-allaying practices were compiled from the reports of Federal inspectors on 1,657 bituminous coal and lignite mines in 25 states, employing nearly 500>000 men. Most of the information is presented in tabular form. It is shown that approximately one-third of the mines employ ing 25 or more men provide no protection, or inadequate protection, against dust from the working face. In a still greater number of mines, the dust produced during loading and transportation is not being allayed effectively. Bock-dusting will reduce the dust explosion hazard in such mines, but dust allaying will reduce the explosion and pneunoconiosis hazard and provide better visibility. Generally dust allaying was practiced to a greater extent in mechanical-loading mines than in hand-loading mines with fever workmen. Mines employing less than 25 men were not included in the study, but probably dust allaying is not practiced in many of them. -- Condensed from Authors' Summary and Conclusions 1055 Shuttle-Car Tire and Roadbed Study. R.Z. Nicholas, J.S. Whittaker, D .D. Domenburg, J.P. oamon and V, Bank. Bur. Mines Rept. of Invest, -62k, 22pp. (December 19^9). The investigation revealed that "hard rock lug" tires had a kneading action that nixed calcium chloride more rapidly and effectively with the floor material, thus tending to diminish one potential source of dust. Shuttle cars equipped with "smooth tread" tires steered.harder, tended to remain in depressed tire tracks, or remained bogged in "chuck holes," 1 r i:- I 4-. tene gesi INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL -TOXICOLOGICAL LEGAL- dciion Qua* SEPTEMBER, 1950 (Vol. 14, No. 9) VT 11 INDUSTRIAL HYGIENE FOUNDATION <400 HFTH AVENUE PITTSBURGH 13, PA. f-j&irstiff- ;5 ^ / H r'' / tx/iibit ' inzu^tr'.1 gvgiene Digest - 1U oerzsncsr *2052 Other Dung Diseases Due to Dust. A,T. Doig. Postgraduate .Med. J. 25, (Dec. 19^9). A review is given of the effects on the lungs of various dusts, mainly nixed dusts. These often contain a rroocrticn of silica it is questioned vhether their effect can be attributed to it. Among these dusts are these derived from carborundum, aluminum, graphite, iron, tin, manganese oxide, and beryllium. The node of action of vegetable dusts is obscure, although a variety of pneumoconioses have been attributed to them. -- Condensed from Bull. Hyg. 1055 Asbestosis. H. Vyers. Postgraduate Med. J. 25, c5i-o58 (Dec. 19^9). Asbestos and talc are the only tvo silicates which have been shovn to produce pneumoconiosis. Gardner, in 1958, suggested, on the basis of animal experiments that the effect produced by asbestos was mechanical, since it was produced only by long fibers. A later authority made the observation that workers exposed to very ehert-fiber asbestos were not affected by it. As bestosis vas officially recognised as an industrial disease In 1950. The condition is thought to be due to blocking of the finer bronchioles by long fibers which seem to irritate the bronchial wall and cause fibresis. TUbercu losis and carcinoma of the lungs may folio-3, as complications . Recognition of the disease, and precautions which have been taken have lessened its severity and incidence. -- Condensed from Bull. Hyg. a Heviev of Dus t - Ailsvtnr Practices at Vcrkirg Faces in Some 3 i turn incus Coal and Lignite Mines . J.J. Forces, R.Z. Franklin S.T. Beese. U.3. Bur. Mines Inf. Circ. 75-86 29pp (May 1950). Data on dust-allaying practices were compiled from the reports of Federal inspectors on 1,657 bituminous coal and lignite mines in 25 states, employing nearly 500,000 men. Most of the information is presented in tabular fora. It is shown that approximately one-third of the mines employ ing 25 or more men provide no protection, or inadequate protection, against dust from the working face. In a still greater number of mines, the dust produced during leading and transportation is not being allayed effectively. Pock-dusting will reduce the dust explosion hazard in such mines, but dust allaying will reduce the explosion and meunoccnios is hazard and rrevide better visibility. Generally dust allaying was practiced to a greater extent in mechanical-loading mines than in hand-loading mines with fever workmen. Mines employing less than 25 men were net included in thS study, but probably dust allaying is not practiced in many of then. -- Condensed from Authors1 Summary and Conclusions 1055 Shuttle-Car Tire and Roadbed Study. P <3. Nicholas, J.S. Vhittaker, D.D. Domenourg, J.?. Harmon and V. Bank. 3ur. Mines Pept. of Invest. I62D, 22pp. (December 19^9). The investigation revealed that "hard rock lug" tires had a kneading action that mixed calcium chloride more rapidly and effectively with the floor material, thus tending to diminish one potential source of dust. Shuttle cars equipped with "smooth tread" tires steered.harder, tended to remain in depressed tire tracks, cr remained bogged in "chuck holes," (