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[Don Bowen <don.bowen AT earthlink.net>]

On 6/25/2012 9:30 AM, WILLIAM JONES wrote:
> It's important to realize that an ordinary Archimedean screw gets water and air 
> alternately simply by the fact that the "snout" (the end of the hose) dips 
> into the water and then back into the air.

An Archimedean screw is simply a wedge wound around a shaft.  It can be 
enclosed in a tube or sit in a trough.  For pumping water either will 
work but the end is not moved in and out of the water.  What ever air is 
moved is incidental to the process, not a part of it.

--
Don Bowen           KI6DIU
http://www.braingarage.com/Dons/Travels/journal/Journal.html