| |
| | Modern Rebreathers |
 | | This type of apparatus was manufactured in Germany by Draeger, in Britain by Siebe Gorman, in Italy by Cressi-sub and by others in the USA during the war years of the 1940s. |
 | | Here we see a postwar military clearance breathing apparatus, the C.D.B.A. The gas used is an elevated percentage of oxygen in air - nitrox - with mixes between: 60% oxygen, 40% nitrogen, for up to 20m depth, and 32½% oxygen, 67½% nitrogen, for depths of up to 50m. |
 | | The mixture is chosen for achieving a target depth, whilst reducing the nitrogen in the body and thereby decompression time. |
| www.secret-bottletop.com /diving/Script2/P11.html (564 words) |
|