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When at last the air pressure in the cylinder becomes almost equal with the water pressure surrounding it, it becomes impossible to breathe. But the moment the diver begins his ascent towards the surface, the air in the tank expands and provides him with a few more breaths, which are adequate to get him safely to the surface.
And, in that context I looked at my copy of 'The New Science . . . ' and here is what it says about valves:If you want a more scientific approach to SCUBA diving at that time try The New Science of Skin and SCUBA Diving and the US Navy Dive Manual.
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BTW 160 pages with a cover price of 1.95.
Wait...... I thought everything was a nickel back then? At least that was what my grandfather always claimed. Was this a gold leafed book?