Document wD45dQLQVvk67yB2nOqNN1X1Q

JMcN:2I DISTRICT HOSPITAL riTnnnpT.Tg Date 23 nd. March,...1.960, ADDENDUM TO REPORT ON THE HEALTH 0? WORKERS IN WITTENOOM. 1959. Information has now been obtained from Canada, through the courtesy of the General Secretary of the Chamber of Vines, confirming my impression that the Konlaster in use In the State Is not an effective instrument for dust counting In the Asbestos Industry. In the Quebec Asbestos industry a Midget--Impinger is used. It Is stressed that fibres over 10 microns In length are of particular Importance and whilst the total dust concentration should be below 10 million particles per cubic foot of air, the maximum fibre count; ie over 10 microns In length, permitted, is 1 million fibres pei* cubic foot of air, I have fuller details if required and I understand that copies have been sent to the senior Inspector of Mines, Kalgoorlic and the Manager, Australian Blue Asbestos, Vittenoom, CHEST msiCXAH and MINES MEDICAL OFFICER 081