Irregular cylindrical grey inhaler that has been sectioned for teaching purposes. The centre dial is labelled "E.M.O. ETHER INHALER", and controls for the percentage volume of ether released, from "close for transport" to 20%. The sectioned areas of the apparatus have been painted yellow and expose the vaporising chamber, wick, ether level indicator, temperature compensating valve, air bypass chamber and mixing chamber. anaesthesia, vaporizer, vaporiser, sectioned, inhaler

In 1913, Mark Cowley Lidwill designed a machine for the purpose of mechanical or insufflation anaesthesia. The Lidwill machine was a portable machine weighing 7kg that could easily be packed into two small bags. The machine involved compressed air being delivered to an ether vaporiser. An ether/air control device allowed varying concentrations of ether to be delivered. The ether vaporiser could be immersed in hot water to prevent cooling and the ether temperature was measured. From the vaporiser, the ether/air mixture went through a trap bottle, then to a crude mercury blow-off valve and subsequently to the patient.Large leather suitcase style bag divided into two levels containing and insufflation anaesthesia machine.insufflation, mark cowley lidwill, thoracic surgery, positive pressure