On the other side of the mouthpiece, excess and exhaled air escaped from a simple rubber "ducks bill" valve. The diver's nose was pinched by a pair of spring clamps ("pince nez") to prevent ingress of water, and his eyes were protected by small goggles with rubber surrounds.
Excess and exhaled air passed out through the mouthpiece's counterpart via a simple rubber "duck bill" valve. The diver's nose was pinched shut using spring clamps ("pince nez") to keep water out, and his eyes were protected by small goggles with rubber edges.