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STORIES OF INVENTIONS AND DISCOVERIES

Aqualung


Invented by: Jacques Cousteau and Emil Gagnan
Nationality: French
Date: 1943
Purpose: to supply air to free-swimming underwater swimmer, at the same pressure as the surrounding sea.
Jacques Cousteau told Gagnan exactly what he wanted. Emil Gagnan made it. With unregulated compressed air supplies, and with sea pressure increasing with depth, there was always a danger of an underwater swimmer's lung collapsing.
The aqualung has a special valve regulating the air supply.
As the diver breathes out, the pressure of his breath opens an outlet valve which also shuts off the air supply. As he breathes in, the internal pressure falls and the outside water pressure closes the outlet valve and switches the compressed air supply back on. The air flows in until the pressure in the valve is the same as the pressure of the outside water. Then it cuts off.