Porpoise (scuba gear) Porpoise (scuba gear) Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards. The first Porpoise was a closed circuit oxygen rebreather, and the following models were all single hose open circuit regulators. This rebreather was developed by Ted Eldred in the late 1940s and early 1950s. Some were made and used for sport diving, but they did not go into full production. It was worn on the back without a casing. The bag was between the canister and valve assembly and the diver's back. It had two wide breathing
History of scuba diving they could be used due to the risk of convulsions caused by acute oxygen toxicity. Air Liquide started selling the Cousteau-Gagnan regulator commercially in 1946 under the name of "scaphandre Cousteau-Gagnan" or CG45 ("C" for Cousteau, "G" for Gagnan and 45 for the 1945 patent). The same year Air Liquide created a division called "La Spirotechnique", to develop and sell regulators and other diving equipment. To sell his regulator in English-speaking countries Cousteau registered the Aqua-Lung trademark, which was first licensed to the U.S. Divers company.(the American division of Air Liquide) and later sold with La Spirotechnique and U.S. Divers