What is "aeroscope"

Aeroscope \A"["e]r*o*scope\, n. [A["e]ro- + Gr. ? to look out.] (Biol.) An apparatus designed for collecting spores, germs, bacteria, etc., suspended in the air.

n. A device used to collect dust particles, spores etc from the air for subsequent analysis.

Aeroscope was a type of compressed air camera for making films, constructed by Kazimierz Prószyński in 1909 (French patent from April 10, 1909) and built in England since 1911, at first by Newman & Sinclair, and from 1912 by Cherry Kearton Limited.