Porpoise (scuba gear) Porpoises still exist. Only a few of these early models are known today, the rarest being the CA-2, made for use with two tanks. 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
James May's 20th Century chronological order. The programme is now shown on Eden, Yesterday and Dave. The theme tune is called "The Long Boot", by Jeff Knowler. Sam Wollaston writing for Guardian Unlimited described James May's 20th Century as "essentially Top Gear, masquerading as something educational" but conceded that if "teaching history can be achieved through Top Gear, then maybe that's not such a bad thing". The New Statesman thought that James May was "ill-suited to the task in hand" and described the biggest problem as May being unable to "put his wretched motors behind him". The Lancashire Telegraph wrote positively of the show