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Porpoise (scuba gear)
Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards. It included:
==A make of diving oxygen rebreather==
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 tubes like an aqua-lung or an IDA71, running to a mouthpiece, which had a shutoff button to keep water out when it was not in the mouth. It appeared in three versions: MK1, MK2, MK3. It had a special valve that both breathing tubes ran through: it was activated by surrounding pressure; when he got deeper than was safe for pure oxygen it restricted (not stopped) the supply of breathing gas, to tell him to go to shallower depth. (Before open-circuit scuba was readily available in Australia, many Australian sport divers used war-surplus Siebe Gorman Salvuses.)
*(Images of Porpoise )
*(Link to page with images ) about Ted Eldred's oxygen rebreather
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