konimeter

konimeter, coniometer, jet dust counter 1. An instrument for measuring the amount of dust in the air. 2. A portable instrument for making a rough and rapid evaluation of airborne dust concentrations. It consists of a hand-primed pump that draws a known volume of air through a jet on to a plate on which particles ar counted under magnification.
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konimeter

instrument measuring amount of dust in air
Found on http://phrontistery.info/k.html
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