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> Independent doubles have two major disadvantages compared to an isolation > manifold. > > 1. Any failure AT ALL immediately disables access to HALF of your gas > supply. [excellent reasoning deleted] > > 2. Higher diver workload in routine diving. The diver must continually > switch between the two tanks if he wants to maintain his trim in the water. First, let me say, I agree an isolation manifold is better. The point I am still uncertian about is if it is hogarthian. It seems to me that most hogarthian divers have the following logic: This configuration is good, therefor it is hogarthian. In this way of thinking, hogarthian starts to loose meaning. I would suggest that the line of thinking should be: This configuration is hogarthian, therefor it is good. It's a small point, but in this case, I think it applies. Now, on to the discussion of the isolation manifold. It is my understanding that in a hogarthian rig, less is better, and only bring along something if not having it signifigantly decreases you chances of survival. By signifigantly, I mean, you can ignore the 1 in a million chance of failure. So, the question of manifold == hogarthian is, does leaving it at home decrease my chances of survival? First question is, how likely is a failure that will eliminate half my gas? In my experience I have never seen (or heard of) this happen. But then again, my experience is lacking. Additionally, If I am using the rule of thirds, at any point during the dive, I can lose half my gas and still have enough to surface. From this, I now conclude that a manifold is not hogarthian. Once again, I am not saying a manifold is bad. Just that it is not hogarthian. An isolation manifold has many advantages. Enough in my opinion that it is good idea to use one. My point is that the reasoning behind using one is based on considertations other than hogarthian values. Andrew andrew@ce*.co*.jp* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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