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A.APPLEYARD@fs*.mt*.um*.ac*.uk* wrote:- > ... There could have been automatic mixture rebreathers as long as there > have been fuel cells (to use a little fuel cell ... Carl Heinzl <cgh@ma*.ai*.mi*.ed*> wrote:- > ... the *REAL* advantage in the new rebreathers ... is the real time deco > calculations which would not have been reasonable until sometime within the > most recent 5 years or so. ... [as in] laptop powered CPUs ... I regret that: out comes my hobbyhorse again, to point out that siamese twins are being made of two matters that should be separate:- (1) Keeping the ppO2 at 1.6 bar regardless of depth and what the diver does. (2) Providing a decompression meter (= `bendmeter') With (1) only, automatic mixture rebreathers could have been made long ago. With (2), what is needed is a SEPARATE nitrox/heliox dive computer that has a lead that can be plugged into the set's ppO2 sensor and cylinder contents gauges; if it is not plugged into a set it assumes "air, aqualung" unless he tells it otherwise. That way each expensive set is not expensively tied to the same diver, but another diver can use it when the first diver needs a rest.
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