Sailing Glossary - Term Owens dust recorder

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance from the slit. Analysis for quantity and size of the particles is made using a microscope. The vacuum required to operate the instrument is developed by an attached hand pump.