Document gaarjxkqGwdogzL8MK2eBpdY3

0 1 3 6 7 .0 0 0 PLAINTIFF'S EXHIBIT I Ii \ 51 t t I1 \ s (<C^1 I , I ; sI*'. > kmstrim y f r <4: HiUictuu Qbshacts MEDICAL I ENGINEERING < LEGAL - - - decisions and trends Je M1 i; tfnclu$tual Health Tlews **< A irj * .4 j.< !S teSST i* <t*Immmd Ummtktf Oy INDUSTRIAL HYGIENE FOUNDATION 4400 FIFTH AVENUE s *1 PITTSBURGH, PA. *' # J ( :'< OH!5 . 4 tri?l Hygiene Dices' - 25 Methods of Detection and Determination V` Ijf --Crf. f^GCwersepath.',~10, 473*1 ApriS~X3T"Te5hiLru. -ries In'Asbeszcsis. Kuehn. 71-c author reports some microscopic studies of asbestos cad of lungs of nsbeseasis victims fer the purpose of determining what variety' of asbestos is respons ible for esbestosis. Serpentine (chrystolite) esbestos is the fora cent-til*/ used, andTt wns supposed that it would be found in lungs with esbestosis. Duadius and Bygdea disclosed, however, that only hornblende esbestosis is demon strable in the lungs, suggesting that serpentine dust is deccnposed in the tis sues. Thu author used the electron microscope to study the form, size end structure of asbestos, both in free dust and as found in the lungs. It is usual ly easy to distinguish the..two forms under the electron microscope, the serpencine variety being generally curved, deni and transparent, and hornblende rigid and greater in disaster. However, examination of the particles from 3 lungs did tot indicate dearly what variety was present. Tbo phetoaicroscopic determina tion cf the refraction exponent, suggested by Sundius and Bygden, was then em ployed. That method revealed that the large asbestos needles isoletcd from the lungs were of tao hornblende type. It is conduded that serpentino asbestos is cococposcd in the lungs and is the cssentid .cause of fibrosis. Kben esbestosis lungs ore macerated with nitric acid and hydrogen peroxide, both free asbestos scudles and asbustosis bodies arc obtained. Hornblende asbestos shows no signs of dccccpcsitioa by the organism, either in the free needles or on the asbestosis bodies. ?cltrieraohic Determination of Lead in Bones. . L'einig. l.Physiol. Chem., LTD, 133-162 119421. I German). The polnrigrnphic method, which is fully described, has the advantages of uso of smdler amounts of aaterid, simpler preliminary treatment of the bone ash, end the automatic action of the polarigraph. Bice heel 3try of Silicic Acid..pi. Isolation and Identification of Minerals in Luzc Residues and Air-5orr.e:arj3t^fK>a..c^i ; Mines. G. Nngelschmidt and 2.J. King. Biocnca. J., 35, 152-153 (1941). The isolation of mineral residues from lungs by digestion with hydrogen peroxide ~d s^jovol of carbon from these residues and from air-bomo dusts by heating to 'itFC are described. The minerals in tho residues arc then identified by diffraction methods. Data are presented for tho constituents present in lung residue and a mine dust; the main components arc quartz and .a member of each of the mica and kaolin groups. A Dew Method for the Determination of Free Silica In Industrial Dusts. A. --.lar.ur and L. Silverman. J.Ind.Kyg. &.~Tox.. 25. 139-140 (April, 1943). The authors describe a new method for free silica determination, in which the duet sample is first passed directly through a controlled flame, fusing practi cally all particles except those of silica. The fused sample is then colloctcc by or. ulectrestatic precipitator and removed to a microscope slide for onalysi. Ti:c method can be applied to air-borne or rafter dust samples. The amount of free silica is determined by a direct count of the fused end unfused particles Passible interfering materials are refractories and those which decrepitate at hi^h temperatures. These interferences are not very ccrmca and^hen present c Disinfection with Moving Hat Air. H. rClicwe. It sc Hyg. u. Irfe<ctioask 123, 72?-733 (May, 1942). (German). Cultures of five species of aon-sporing 'ad tso of sporogenous bacteria wore dried on filter-paper, and these were placed in linen bags which were distrib cd raenc packages of clothing in a hot air stcriliner. Cultivation of these cd that in order to be sure of destroying non-sporing bacteria it is advisable to use a temperature of 100-110C. forli hours; the temperature necessary f: destroying spores (130C. sufficed far those tested) is such as would damage fabrics. Hot air sterilisation is therefore unsuitable for clothing if total disinfection is required, but the usual object is to destroy the agents of inf tious diseases, which are non-sporing bacteria and viruses. As night be oxpec disor.tinuous heating for short periods on successive days was no Bore cfrcetlv than continuous heating for tho scac total period. Heat and Ventilation in Air Raid Shelters. W.J. MeGuinness. Heat., Pip., k A. Coad./l5, 193-196 (April, 1343). < This article gives the requirements for heating and ventilating.air raid shcltc The various types of bombproof and splinterproof shelters are shown. Tho bomb proof typo is too expensive to construct, hence the most conton typo is tho splintarproef. Shelter size is fixed by number of occupants. Ho more than SO people should be placed in the eano roes. Space and voluao requirements for overground and underground shelters are given in a table. Heat requirements ar lew because of the nunbor of occupants, however, heat losses in England arc different from ours because of climatic conditions. On this basis an undorgrou shelter is preferable far American climatic conditions because of the lower (.round temperatures which aid in haat loss maintenance. Ventilation require ments arc given and the various type3 of systems employed are illustrated. Mechanical systems v.ith filtration are recommended. `Vartime Operations Soohasiza Industrial Hvfjene Problems of Asbestos Industry. Illinois Labor Bull., 3, 10, 11, 22 (February 28, 1943). Tho control of nsbestosis must be an engineering control because tharo aro no. nodical means to dwtcct the disease until much hana has been done. Engineering control consists of tv* important principles: (1) Adequato exhaust, (2) Coed housekeeping. By experiment it has been estimated that .if the air contains less than 3,000,000 particles of asbestos j.-or cubic foot thero is small chance of the workers developing.asbestesis. The article lisrs the procedures in the manufac ture of rigid'and of textile asbestos products and shows that further protective measures arc still needed in most plants. X Industrial Medical Practice C.O. Sappington. Ind. Pin ial health, wchifcth arr?r*c\ "1-oiificd into those of medical neministratioa, thaso of public health in Indus*.r.d in the community :.r.d those relating to industrial hygiene and sanitation he plant. Grief but rather comprehensive discussions of the following prob.ra presented: Venereal Uisense control; nutrition; Immunization; Prcplaco-