>>. (Try sustaining 50 inches for 15 seconds; you'll turn bright red!)
>>John Rhodes

>Has anyone performed this type of experiment?  Anyone have some
>similar data for comparison?
>-- Robbie Rhodes

I don't have data, but in regards to the attempt to
sustain 50 inches of water pressure:

This can be done by simply placing a reservoir 50 inches above the
bleed hole and connecting the two by a hose.  If the reservoir is
filled so that the top of the water level is 50 inches above the
bleed, that's 50 inches of water pressure.  No need to blow with
your mouth and the pressure will remain constant as long as the
water level is maintaineed in the reservoir.  For 40 inches H2O,
just lower the reservoir 10 inches.  Be sure the tube connecting
the reservoir and the bleed is sufficiently large so that surface
tension and capillary action effects are negligible (you probably
need a feed tube larger than 1/4" diameter).

I had a friend who once told me that I have a knack for stating
the obvious.  I think he's right.

Hope this helps,

Larry Toto