Apparatus for washing and cleansing air or smoke, also for general ventilating purposes, and for disinfecting or perfuming / [Thomas Green].

Public Domain Mark

You can use this work for any purpose without restriction under copyright law. Read more about this licence.

Credit

Apparatus for washing and cleansing air or smoke, also for general ventilating purposes, and for disinfecting or perfuming / [Thomas Green]. Public Domain Mark. Source: Wellcome Collection.