Document a4Va2aMXzQ0w5d1V7Eyn7dXzN

Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL .. TOXICOLOGICAL LEGAL.. . daciaioni and ti AUGUST, 1957 <Vol. 21. No. 8) INDUSTRIAL HYGIENE FOUNDATION .MELLON INSTITUTE MOO FIFTH AVENUE PITTSBUBGH 13 PA. FOUNDATION FACTS FMindstiM PMt I* MrtMjM to ! indvatrial >mmtm Wdt* w>wi>ri|r to' Indnttritl Hytiwi* VmitoatlM. TIN Ftwwtottow * f Udwto*to Hr to dwaiMMWfrt f hMrttkfNl wwtl<. ' 19 August, 1957 No. 8 ;;; NEW MEMBERS OF I-H-F Three companies have newly affiliated with Industrial Hygiene Foundation, ' lire welcomed to membership. They are: .. gg*?; The American Metal Company, Ltd. Ingersoll-Homphryes Division of , v.. Borg-Warner Corporation , - . J-clede Steel Company ACiTc'- firms' .-\Ziatdh,;Research Adviserto Industrialjfygtene,_JS r^:|^opp.where he im surveyingiodaetfial^io^ ^^wM ^ ^v ` ri|pMs-Travel F^low^lp hetnfi&yo^g tiiree '* " tltHnivereitlee',and^todusirte* in' Swedes ^EGOroXNNBALl1flE27r^ :tobecJOW?i; ?yVi Addlti ................... r.** r M V a* *< .: .m>v-v ..A*A*a's*f*F*e y U may be obtained upou reque#t ot the Don^ld E, _ 3^c}uxe^for 1957, ^Growth and Progress in Industrid.Hy^eMifi^y.p^;:Hi^, . ' ' `'-V :-vv:; '.**) limited number of reprints have been obtained?! two,,-s'***J ,in.theTxansactions of th21flt Annual Meeting of " - -* ----------------------------------------------------------------------------------------- -------------------------------------------------- ----August, 1^57 1010 The Theory of the Cause of dilicosis. K. H, Soffge. Neues Jahrb. Mineral,, Monatsh. No. 1, 12-22 (1957}. German. The author discusses the causes of silicosis and reports experiments on the adsorption of silicic acid. Results are given in graphical form only. One graph shows the adsorption of silicic acid by AljOj-nHjO from Ringer solution containing 106 mg. silica per liter as a function of pH (5.5-8. 0). On another graph the adsorption of silicic t acid by FejOj-nHjO from Ringer solution containing 28.7 mg. SiOfc per 1. plus 30.4 mg. CaFi per 1. is shown as a function of pH(6. 8-8. 0). In all cases there is a marked- but irregular increase in the adsorption with pH. The breaks in the curves are interpreted as being connected with silicic acid polymers. __Chem. Absts. 1011Results of Functional Respiratory and Circulatory Tests of Workers .Exposed to Asbestos Dust over a Number of Years. M. Navratil, V. Krecek, and L. Cvachova. ~" Pracovni Lekarstvi 8, 329-333 (1956). Czech. Sixty workers exposed to asbestos dust were classified according to severity q asbestosis and according to age. They were subjected to functional tests for prolonged expiration and for ventilatory coefficients, and to electrocardiography. In the over 50 age group, quite apart from all radiological data, a drop in vital capacity is found, due not merely to age but also to emphysema which was detected in 19 patients. The ventilation coefficients in the asbestosis-free and early asbestosis groups were within normal limits. In those with advanced asbestosis there was a distinct drop in the ventilation coefficients, due to fibrosis and associated pathological conditions. The differences in the carbon dioxide ventilation coefficients and in the vital capacity figures were on the limit of aignifi. cance. Hypertrophy of the right heart was present in two subjects with advanced asbestomit, -- Cond. from Bull. Hyg. 1012 Industrial Hygiene Problems in Open Pit and Underground Mines. M. L, Roberts. Presented at Eighth Conference of McIntyre Research Foundation on Silicosis, Oct. 22-24, 1956. 6 pp. (1957). The hazards discussed in this paper include: the dust hazard in open pits; the dust hazard underground; heat and humidity; noise; fumes and gases; and radiation. The larger portion of the paper deals with the dust hazard. Various sources of dust both in open-pit and underground mining are evaluated, methods of dust sampling and deter* mination are discussed briefly. ---------------------------------------------------------------------------------------------------------------------------------------------------- -------------- - "PHYSICAL. ASPECTS OF THE ENVIRONMENT 1013 Acoustic Power Level Determination for Machinery in Hard Rooms. W. J. Burch. Heat. Pip, Air Cond. 29, l6l-164 (June 1957). The purpose of this investigation was to determine the feasibility of writing noise specification in terms of acoustic power (or acoustic power level) instead of the presently used system involving sound pressure levels. It was desired to determine whether power level measurements could be made in acoustically untreated rooms. Tests using three different sound sources in rooms of various acoustic properties show these measurements to be feasible. Various types of machinery mountings had negligible effect upon recalculated power levels. Editor's summary 22.