Document G6Dex4bgzmjdnwK33rarejN1N

FILE NAME Talc TALC DATE 1948 DOC TALC116 DOCUMENT DESCRIPTION Abstract from Medical Journal Article - The Dust Hazard in Tremolite Talc Making BRITISH JOURNAL | OF INDUSTRIAL VOLUME FIVE eee VOLUME FIVE cee : 1948 EDITOR DONALD HUNTER . LONDON BRITISH MEDICAL MEDICAL ASSOCIATION ASSOCIATION men of whom 1,090 bad apparently normal lungs Of the 271 men with demonstrable abnormalities he found Bicosi that 23 of those in stage I of of effort Of the second a te. ae had this symptom Of the lungs 14 had dyspnea ; is difficult importance this symptom to assess its therefore consider that the symptom by the French government capacity and compensation and that tests of the venous circulation do not help clucitating The authors given to this in judging in- very doubtful Take The Dust Hazard in Tremolite 1947 YaleJ. BioMled The literature talc dust is reviewed nonths pneumoconiosis in in USA the me Europe and have reported crude of generalized : of consisting Sumaries . noths . fibrosis among workers cases the U.S.A. are given no necrop findings being in quoted A study of tale miners and millers St Lawrence County N.Y. is detailed The tale mined is a fibrous variety called asbestine accompanied by tremolite in fibrous state The free silica content of the dust is stated to be less than 187 In mines the drilling isdry and little dust control is used concentration figures sampled by midget impinger Dust given At the mills the material is crushed screened milled in pebble- mills separated and bagged : some control measures are used the last two operations Seon! : An initial radiological survey showed pulmonary oo: hazy fibrosis in 14-5 of 221 menexamined givaisnoftg * ground " appearance or granularity of the lung estosis Ipaved lave is and lubted ; d brief cer of g with can ot cannot fields and in some cases nodulation radiologically of |. silicotic type A table shows of that those aged 50 or over 51.ws as o51.snon 51.son 4.9 of the controls carpet- workers and in 51.son of the workers Fibrosis wasrelatively more prevalent among millersthan among miners Symptoms were those of pneumoconiosis ; dyspnoea was greater than the radiographic changes might have suggested The incidence of active tuber- culosis was slightly higher than expected In % of the 221 men deposits or plaques of opaque material often of considerable sire and apparently in the visceral pleura were found These tale plaques have no relation to previous infection and may not be associated with fibrosis in the adjacent parenchyma with changes in the corresponding hilar glands some cases no other lung changes were found : the plaques are considered . asbestosis be symptomless A marked similarity is indicated between tremolite pneumoconiosis and The author conclude that this dust carries a definite risk its is and and that its control is necessary L. W. Hale with impor- impor- ting Silicosis Changes Petmonary Changes in in the Vesl Silicosis Silicosis Vessels in Le Le alterazioni dei vast polmonari nella slicosi NUNZIANTE CESARO A. and PECCHIA L. 1947 307 Med d Lavoro 38 307 fa Coal reffort lleres Appraising Exposures to Silica Dust HOLDEN E. R. HEMFON W. C. and Hyart E. 1947 J prof industr Hyg 29 265 ; uners Begrees 301 The risk of silicosis depends largely on the size of the silica particles inhaled and it is considered that particles less than 57 and especially those of 1 to 4 are the movate movate and danga u is well known tied be