Document emYpkzxzGRbEBVo8xwkDQO1q9

#-' (r... . " t'" . . . 2 ^/t-33 *th Ju)v 1916 crist QuxnnY enquiry Defore reeding hi* lUtiMnt, Dr. J C. Vagner itAUd that he waa ptkktnf in hi* own personal eapaolty and not * a eabir of the Medical Raaaareh Council. Dr. Vegner said that ha had vlaltad tha Quarry on tha evening of bth July* aftar tipping had oaaaad. Ha did not go down Into tha Quarry, but looking at it from tha road ha eould aaa no avldanco of excessive duat* Aa far aa ho knv, tha whlta aabaato* duat, bagged and tippad aa had baan described, would not eauaa a haaard to haalth. However, investigations war# atill going on, aa plaural tunoura had ooeurrad from ralatlvaly alight exposure to aabaatoa duat. Any aabaatoa duat would eauaa aabaetoele, and in Canada and tha Uni tad States it waa bellavad pleural tunoura had alao baan caused by whit# aahnatoa. Acbeatoole, or scarring of tha lung, vaa only duo to axcaaalva axpoaura to duat, for example, in people jerking In dully cunetant axpoaura to it, Thersfop, thcro waa a naed to control all unnacaaaary exposure to thla Mineral. Dr. Vagner agreed that aa long aa a clear definition wee made batwaan what waa duet and what wee broken material, and floor sweeping# were bonded with realn, that waa sufficient. Dr. Vagner thought thet the present arrangements for tipping (bagging, sealed container# and a covering cf earth) ware remarkable and a vary good idea. He added that, in th. present stage cf knowledge, the begged duat would not be a haaard to health. t , ! f Jt tf -2- Dr. Vagner eald that he did not fully egreo that tumours would occur as a result of axpoaura to chryaotlle aebostoa. There was, however, some evidence from the United States to the contrary and more comparative survey# would be neceeeary. Chryaotlle aabaatoa waa suspected of ceuelng tumour#, but opinion waa still doubtful. Carcinoma# of the lung were not limited te any one type of fibre, chryaotlle included. An experiment of Dr, Vagner'a involved tha exposure of rata to fine chryaotlle duat. One rat hAd developed a pleurAl tumour and had died, and the tumour waa found to be similar to those scan In human beings. However, thla waa only an early experiment and there was a large number of experiment# still going on, . He aU that it waa true paepia in the United States were dying of aebeatoele which eould be traced to chryeotlle aabaatoa, but there ware no tumours. People living In tha vicinity of a certain faotory using chryaotlle asbestos ware found to bo suffering a health hazard. However, although tba factory waa using chryeotlle aabeetoe today, it waa not possible to ascertain what they had been using 20 years previously. Dr. Vagner agreed that if the duet escaping from Crist Quarry waa exoeeelve, there would be a health haaard, but the amount of asbestos duat in tha atmosphere must be higher than the figure obtained as a result of tha duat counts, Zt waa nacaaaary far a considerable amount of white aabeetoe diet to be in existence to cause cancer of the lung and aabeatoaic. a *. "f ' agreed that there should be fencing round tho Quarry to pr.v.nt chlldron playing there, *lthouCh the rlok of exposure vi not great tf tho dunped notorial woo covered. Any quarry should bo fsncod to stop chlldron falling down. Or. Vagner agreed thsro would bo a hoalth rlok if exposure w#ro excessive. "Tho conditions whoro It lo roolly dangerous i whoro you cannot mo tho chap working next to you**, ho oald. ' irarwnrrr.aaaasBSMS r\\ o e w T JCV/y EOSSJS lr .Mv l. 22nd Juno, yh J^ro^yr. s JL s . ^ It has boon accepiod for at watt forty shut thoro ii a rlok t Individuals exposed to otcoyilveascun;. aebosto* dust in ^idustry. Tho cust produces a j.zp^row-vo fibrosis (scarrinM of tho lung, called 7k..' t>.* last tvonty years a hat also boar ol.owr. that jKrs :j an association bo;weonV>vra asbostoais and candvi* of tno lung. Thu asbestos induttr^U* wall awaro of tt.as^Mo-U hu-sard* and rigorous control of tt^^dust within the fa^yories is now wlduspread. T'oo r,oir>0CCup&ipnl et* jW s&bcstosl* have bo reported froa various eounWo< but tt^Ru^bsr L sen 11 enuparud to tho total casos of ssbtitVis, tnwbo dloue is usually not sovoro. Within tho last ton^^|Fs ihoro havo boon thro* findings which are rolovant to tho boslthjLssrd of r.on-4ccu)utinnal exposure to aabootoa dust. TuojM i^srvstlons aro still under intonsiv# investigation and itM* no^kt>osiblo to roach a final conclusion as to thoir slgnlfjpanee a^phls tlao. - . Tho first of thc^S findings tho discovery of -asbestos fibroa in tho lur.|p of poopla wi%t no known occupational exposure to asbestos. Rtopt* have boon pdLlishod froa hospitals in Croat Britain. South tfrica. Tho United sWtes and Finland, and other countries. EArm and o0 of l^or individuals havo boon shown to ear^F asbestos fibroa withinWhe lungs. In . the uajorlty of indlv^Kals tbe nuabor of fxbros |krossnt la not nuaoroua except In tfcMe who have boon exposod occasionally or llvod in areas aoro Mian usually closely associated asbestos sioltj or prcductio Tho ssvbnd of those observations Is tho discovS tr Finland and i^fcorcany and in seas othor countries that tfl . definite areas e# thickening of tha layers lining tho chest cavity (tho pioM*a) in people living in tho vicinity of usbostos cir.es and ta,cxMrto*. Those pleural thickenings con soootis;** bo * observed cn xmx chest radiograph particularly when they contain calclus salt#but they cay bo present to a slighter degree in these in whoa no Mr*y abr.arxaiity is datooted. This thickening of the pleura hasMoen long known vc be a featuro of these whM h-v* . vCCUpatiuMl exposures to Asbestos. Tho tj.ickonin.; of the plours doc* neM** itelf 07._-.ear to cause disability tn --~.+ \ insisnew*. *-**-c third finding, ar.w prnbnaiy vl.e saportan:. 1* bevery of an association between the ox'.w*Mru te skUs.:-,