Dear Marshall,
Thanks ever so much for the suggestion. I will pass it on
to
the principal investigator. Your suggestions and observations are, always, more
than appreciated.
Sincerely, Brooks.
Marshall Dudley wrote:
> BROOKS BRADLEY wrote:
>
> > Our principal problem was in finding the proper
> > continuously-relieving escape valve for the chamber proper. We
> > evaluated several off-the-shelf, and custom made commercial valves. All
> > worked to some degree, but we are, at present, testing a method whicn
> > uses only a couple of variable-diameter holes fashioned in the outer
> > fabric and reinforced against tearing. This latter approach is by far
> > the most economical. However, the downside is that the pressurizing
> > air-supply compressor system is required to supply much greater
> > quantities of air....to keep the bag properly inflated (at about 2
> > atmospheres) and to evacuate the C02 sufficiently.
> >
>
> Consider using a 1 inch or so diameter plastic pipe which is turned up on the
> end. Then place a hollow plastic ball which is larger then 1 inch in
> diameter on top of the opening. This will regulate the pressure quite
> effectively. Since the area of the pipe will be 3.14/4 = .785 square inches,
> then the pressure will increase about 1/.78 = 1.27 psi per pound the ball
> weights. So for a 15 psi level (2 atm.), you would need the ball to weigh
> just under 12 pounds.
>
> If you use a 2 inch ball, it will have a volume of 4.2 cubic inches. Filling
> with water would give .43*4.2 = 1.85 pounds. To get a weight of 12 pounds
> would require filling with something with a specific weight of about 6.5 or
> more. This could be accomplished by filling about 80% full with iron filings.
>
> Marshall
>
> Marshall
>
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