At 08:30 am 01/06/2006 +1000, Robin wrote: > [snip]
> I think Fred has a device that enriches O2 based upon > some form of filtration. Perhaps he can enlighten us > as to the details of its operation and perhaps a > patent number? On the subject of O2 enrichment, has anyone ever analysed the output of the Ranque-Hilsch Vortex tube to see if the oxygen/nitrogen ratio is the same for the cold stream as for the hot stream? Frank Grimer
