A drum-pump continuous sampler for airborne dusts

摘要: The `drum-pump' sampler described collects a single sample on filter paper over period of up to eight hours, the rate aspiration being about one-third litre per hour. A size selection device rejects particles larger than `respirable size'. instrument was designed for use in working places coal mines and is self-contained portable. novel design water-sealed pump employed may find other applications.