aëroscope

Century Dictionary and Cyclopedia

1. n. An apparatus for collecting microscopic objects from the air. It consists of an inspirator and a glass collecting-vessel smeared with glycerin. When air is drawn through it the fine dust sticks to the film of glycerin.

GNU Webster's 1913

1. n. (Biol.) An apparatus designed for collecting spores, germs, bacteria, etc., suspended in the air.