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I believe that it is well known that a sudden change in gas concentrations can result in black-out. That is why we stage down to the high He mixes, and why we do a gradual change to each mix (1-new & 2-old / 2-new & 1 old / all new, for example). He might have just wanted to try it to see what happens. Who knows? On Tue, 19 Jul 94 14:59:08 BST J Shepherd wrote: > What work exists, if any, on the effects of a sudden switch to >high ppO2 and ppN2 from a bottom mix; 220 feet = 67m, which is often >dived on air. Presumably an acute exposure is far more dangerous. Is >this effect understood at all? > > Jason. >-- >Send mail for the `techdiver' mailing list to `techdiver@opal.com'. >Send subscription/archive requests to `techdiver-request@opal.com'. ------------------------------------------------------- scot@bt*.co* Scot Anderson pp000082@in*.co* Voice: 703/761/6536 CIS:74147.2357 Fax: 703/556/9290
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