I don't recall the length of the hose getting much attention, but it may be crucial, since this kind of seems like a variation of the "long snorkel" problem. I used the following apparati in this experiment:
6-foot hose (Resmed Climateline)
Respironics Comfort Gel Nasal Mask
My trusty recording oximeter, the name of which eludes me right now; something something "50" I think
Johnson&Johnson cloth tape
One dirty sock
Thus:
Now, the experiment. Once again, after a bit of baseline data, 20 minutes of breathing nasally with hose attached to mask (but not to the machine; this wrinkle, suggested by a poster in the earlier thread, is the only difference from the earlier experiment). And the recording oximeter watching the whole thing. But this time, a flash of inspiration came to me. How about seeing what would happen if the hose is taken out of the equation and we see what happens if I breathe entirely through the teeny weeny pinholes between the eyes on the mask. Impossible! Monstrous! Absurd! Gentlepersons, save your ejaculations until you have seen the evidence in its entirety. I shall make believers of you.
Anyway, I had no means to close off the hose-nozzle of the mask, and the 5-minute point of hoseless, free breathing through the mask after the main event, had almost elapsed. What to do? Glancing about me, I espied a dirty sock on the floor, a relic of forgotten revels of the past weekend, most likely. In triumph, I snatched it up and stuffed it into the end of the mask hose nozzle. Immediately it became clear that those tiny pinholes were...very tiny indeed! Still, you can breathe through them, as can be seen below:
