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.
On the opposite side of the mouthpiece, excess air escaped through a simple rubber "duck bill" valve. The diver's nose was pinched to prevent water from entering, and his eyes were protected by small goggles with rubber surrounds.