Porpoise (scuba gear)

An example of the world's first commercially available, single hose SCUBA unit designed and manufactured by Ted Eldred in 1952.

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.