Document R2d3yg1DDnKq8kkV3m1Q1ZZ0n

FILE NAME Quebec Asbestos Mining Association QAMA DATE 1950 Jan 25 DOC QAMA067 DOCUMENT DESCRIPTION Lettetro Dr. Woodard from Dr. Lanza RE The Piezoelectric Theory and with a Reference to Dr. Vorwald " ; COPY - meee NEW YORK UNIVERSITY MEDICAL CENTER OF NEW YORK UNIVERSITY cm ; ean . INSTITUTE OF INDUSTRIAL MEDICINE 477 First Avenue New York.16 N. Y. Murray Hill 3-1800 mY * - 2 spe nn January 25 1950 ce Mr. J. P. Woodard Manville Corporation 22 East 40th Street . mh . et - . ; : ae - yo nr oe SERN eet ene rep New York 16 New York . ne oO : an . Dear Page _ vee Vos : ey I have your letter of January 24th and will give you my slant on this :.. pe: This matter of the piezoelectric theory was presented at a meeting . -~ ae in Chicago last fall and the doctor in Hilwaukee who did the work had an og, exhibit lic read his peper and Dr. Vorwald discussed it Dr. Vorwald got rae ame to out his bowie knife and proceeded skin the gentleman alive This irritated ee a number of people particularly his friends in lilwaukee who felt that was TS a little bit rough nt . . . . . ne . The theory is interesting and I think it is quite possible that this electrical reaction of molecules or molecular structure may turn out to be nw the key to a number of riddles that now confront us particularly in the field of surface irritation whether we are talking about the skin or the surface -* ews . wet . linings in the lungs . , . especialy From your standpoint I don't think important especially at this time We know dust causes silsiliicoscis osis and that esbestos dust that the matter is particularly and everybody admits that silica causes asbestosis and we know how to diagnose these diseases and we know how to prevent them within reason oa orrre . We also know that amorphous silica does not produce disabling pneumoconiosis or any condition resembling silicosis proper The statements in Mr. Elverst - article are inaccurate and fall under the general classification of journal- istic pseudoscience He states In recent years the list of mineral dusts ' known to be capable of causing disease has grown to include such minerals as wulfenite and berlinite which do not contain silicon . " No dusts cause are a cer oe ete 4 silicosis except silica dust No dust causes asbestosis except asbestos dust , : y . 0 . ft : a : The proof of the pudding is in the eating We do not in industry know of disabling pneumoconioses except those due to silica and asbestos It is possible that other materials may be found which will cause a disabling pneu- . moconiosis The beryllium problem which is still being intensively studied e n .may finally cone under this classification or may fall into the cutegory of acute toxic effects The causative factor in Shaver's disease is still in doubt ees It is quite possible that both of these diseases may ultimately be classified en pneumoconioses It is also possible that silica may be the offending agent ..: ss at least in Shaver's disease a . a ere te ae - PRODUCED =: = sern JM 83 ge wo . ww < Fae . oe)oo Mr. J. P. Woodard oy : ae January 25 1950 . otal Fes f Gy : - Ae oo ood a a + te roe wet a ~ - vies , . . F <) { an) sss ? , ; - . . oT oe propounds that Mr. Elvers thetheory that only those diseases which vot show the electrical reaction which he describes cause . Yet * . electrical admits pneumoconiosis he admits that esbestos does not have this electrical reaction so of the... a industrial only two principal industrial dusts that cause disabling pneumoconioses one of them falls into r category . Elwers . . . oe ee ag | , ~~, Pa Ce a. * . | w, - t"ea t There is no question that thesetypes of research are extremelyextremely re valuable end if ve can ultimately find out why and how certain dustsproduce 2| a disabling reaction and why and how some of these reactions are tied in .' Tete with susceptibility to will be greatly aided tuberculosis ' ' 7s: . work in OF ry Pye ge ote control . preventionprevention and ts Dae . sou . Pt rr * . . - oy: With respectto " e clasifcation classification so would non under r Elwers and be a producer of pneumo- ne ome coniosis A great deal more work has to be done before your investigators a ar - correct- at Marquette are going to be in a position to theory affirm reaction ness of this electrical vt or deny the : oa ees Doig , v vets te Bae . Don! 7 4 . . 1 1 * " H With bost regards fo, stoves Bo, . . : te oan | a . + ; * anes . ; j Sincerely yoursnas +e . foages wien // // cote . * . we . out . ; Ppt + . : wa, . t ; e e e ee ee e 1? ate at wee