Document mE5Yy3Lk8VbovqaeVgQZ7an4

37--Industrial Hygiene Fic 37-5a --Portable pump with intake positioned to gather air samples close to worker's breathing zone Air samples are collected on filter paper that are later weighed to determine the concentration of lead and other dusts Courtesy Mine Safety Appliances Company Fic 37-5b --Battery-powered vacuum pump draws measured amount of air through a filter that is later examined under a microscope to determine size and number of asbestos fibers m the sample Courtesy Raybestos-Manhattan, MiUtpore Corporation 1046