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Given the time constraints that define most OWI classes, teaching the use of multiple gases appears impossible. What is needed is a unification of gas use methods. The 1st could B the elimination of 'air'; nitrox then is taught along with the EAD concept, where air becomes a 'special' nitrox. One now has to come up with a set of 'reductions' that would simplify incorporating heliox or trimix into the above concept. That may require coming up with a system of specific mixes that fall, from the standpoint of deco, within recreational limits, yet provide ease of use. In the pedagological sense this unifies 'gases', 'tables' & 'decompression' for introcudtory level classes & may b suitable to teach in a 20 h or so OWI class. Safe bubbles Esat Atikkan __________________________________________________ Do You Yahoo!? Get Yahoo! Mail - Free email you can access from anywhere! http://mail.yahoo.com/ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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