On ventilation by means of Boyle's patent self-acting air-pump ventilators, from "The Sanitary review", 2nd August 1875, and "British mercantile gazette", 15th October 1876.

Public Domain Mark

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

Credit

On ventilation by means of Boyle's patent self-acting air-pump ventilators, from "The Sanitary review", 2nd August 1875, and "British mercantile gazette", 15th October 1876. Public Domain Mark. Source: Wellcome Collection.