Owens dust recorder: Difference between revisions
From Glossary of Meteorology
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<div class="definition"><div class="short_definition">An instrument for rapidly obtaining samples of airborne [[dust]]; a type of [[dust counter]].</div><br/> <div class="paragraph">Particles pass through a cylindrical chamber and are drawn at high velocity through a narrow slit in front of a microscope cover glass. The fall in [[pressure]] due to expansion of the air passing through the slit causes the formation of a moisture film on the glass to which the dust adheres. An analysis for quantity and size of the [[particles]] on the cover glass is made with the aid of a microscope. The vacuum required to operate the instrument is developed by an attached hand pump.</div><br/> </div> | <div class="definition"><div class="short_definition">An instrument for rapidly obtaining samples of airborne [[dust]]; a type of [[dust counter|dust counter]].</div><br/> <div class="paragraph">Particles pass through a cylindrical chamber and are drawn at high velocity through a narrow slit in front of a microscope cover glass. The fall in [[pressure]] due to expansion of the air passing through the slit causes the formation of a moisture film on the glass to which the dust adheres. An analysis for quantity and size of the [[particles]] on the cover glass is made with the aid of a microscope. The vacuum required to operate the instrument is developed by an attached hand pump.</div><br/> </div> | ||
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Latest revision as of 16:33, 25 April 2012
Owens dust recorder
An instrument for rapidly obtaining samples of airborne dust; a type of dust counter.
Particles pass through a cylindrical chamber and are drawn at high velocity through a narrow slit in front of a microscope cover glass. The fall in pressure due to expansion of the air passing through the slit causes the formation of a moisture film on the glass to which the dust adheres. An analysis for quantity and size of the particles on the cover glass is made with the aid of a microscope. The vacuum required to operate the instrument is developed by an attached hand pump.
