The Dräeger Pulmotor was developed in 1907. It addressed previous concerns about lung injury, by limiting both the inspiratory and expiratory pressures. Although still controversial, the Pulmotor was widely distributed and commercially successful. Oxygen from cylinders provided both the inspiratory gas flow and the driving mechanism. Expiration was an active process and gases were sucked from the lungs by negative pressure created by a Venturi effect. This device came with a facemask and harness, with a caution that the operator should take care to prevent air entering the stomach.Draeger resuscitation kit, inside wooden case with handle. Case contains small heavy gas cylinder with large beige handwritten 'S. M E' inscription on one side. Due to water damage case missing pieces of plywood in corner and floor of case bubbled and swollen.|Rubber decomposed rigidinspiratory, expiratory, pulmotor, negative pressure

This is a simple metal mask with an ether chamber surmounting it. The patient breathes air down through the variable orifice over the surface of ether and in through the variable orifice over the surface of ether and in through the inspiratory valve. Exhalation was by means of the expiratory valve placed in the centre of the mask. All channels are extremely small and would offer considerable resistance to respiration.Metal inhaler with shaped rim edgeEngraved by hand into side of mask: DEWEE'S ETHER / INHALER.. 1901. Stamped into side of mask: J.E. LEECO / PATD. NOV. 12-1901 / 400ether, inhaler, ramsay, dewee, leeco