Document wakzvGy47E11GGjRNkJRd8OD

f I EXHIBIT | /6S/&3 1 Heating Ventilating FOR JUNE. 1944 NUMBER 6 Dust as an Industrial Health Hazard F. W. HUTCHINSON 7 Atbettoe dutt it aecood only to free tiliet ia the magnitude of health haxatd which it rrpraaama. Atbcttot it a fibract material o( varyiaf compedtion, bat it anally made up oi approximately 415b mapaeiit, 405b tilica and 145b water. Oxide of ima it frequently pnteat aad appean at dark parddm aimmy the traaalocxiu fibert--the fiben are <4 tack length aad fiacacaa that cloth wciyhiny lett thaa I ex. per aquare yard hat been made from them. The lony condition retultiay from the inhalation <4 ihie dutt ia known at atbettoaia aad rtteaiblm tilieotia in itt main diaical aipecu, bat diflan dot to the enhanced rate of development. Coder averayt indwtrial conditiont the length of employment ia fatal exact it only about one-halt that which it otaal far tiliceeii. It it estimated that then are ia the Caited Sutra approximately lOjOOO men expeead to thia haxxrd at a malt of work ia the ianlattag, tibettet doth, and timilar industries. At it tnm of the ailtcoaia npomrt tttioutca, thia lyttre doaa not take into account the number of pertoat upaaed aa a malt of employment ia the ptecett iadattrieo where aabettoe Sods me. under eariooa trade names, at a biter aid. In one retpect atbcstsdt it lent dead ly thaa ailientit--that it. there it tceminyly a lower tatcereibiliiy iu ihc mrcrventioe of polmonary tubcrralml.. The danger of contractiny the diacate ia apparently me influenced by either age or tex. Like ailicoaia. it ia incurable xnj progrettive; a cate it re ported of a patient who wax expoaed to atbcttot duct for one veer and whotc tputum tSowed the pretence of tahettotit bodict fourteen yurt later. Very few data art available on the relation n( dost concern ration to the incidence of the ditciie. No minimal tafe concentrationt have yet been act up tad information it leant at to tht cooditioot in thoie Har.tt where a harard if known to cxiat. It hat been determined, however, that the aabeaint dutt en countered in fabricatine planti it free of tilica when air ia floated at the breathing level and that the danper oi the duat increaiei aa the quality or lenyth ci tf.e fren increatet. JUKI. 1ta. HlATlMC AMP VtNTiit-ATins