Vintage scuba forum

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Early history[ edit ] Around , in England , Cornelius Drebbel made an early oar-powered submarine. To re-oxygenate the air inside it, he likely generated oxygen by heating saltpetre potassium nitrate in a metal pan to emit oxygen. Heating turns the saltpetre into potassium oxide or hydroxide , which absorbs carbon dioxide from the air. That may explain why Drebbel's men were not affected by carbon dioxide build-up as much as would be expected. If so, he accidentally made a crude rebreather more than two centuries before Saint Simon Sicard's patent.
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The Vintage SCUBA Regulator Collection

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Underwater diving

Physiology of underwater diving Immersion in water and exposure to cold water and high pressure have physiological effects on the diver which limit the depths and duration possible in ambient pressure diving. Breath-hold endurance is a severe limitation, and breathing at high ambient pressure adds further complications, both directly and indirectly. Technological solutions have been developed which can greatly extend depth and duration of human ambient pressure dives, and allow useful work to be done underwater. Physiological response to water immersion Immersion of the human body in water affects the circulation , renal system , fluid balance , and breathing, because the external hydrostatic pressure of the water provides support against the internal hydrostatic pressure of the blood. This causes a blood shift from the extravascular tissues of the limbs into the chest cavity, [2] and fluid losses known as immersion diuresis compensate for the blood shift in hydrated subjects soon after immersion.
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