[Jewelry making - Article 00162] - Re: [Orchid] Venturi Vacuum thoughts

[Robert A. Wise]

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    Hi All, I thought I might chip in with the fact that running water
    will pull a vacuum using the Venturi prin.  I first saw this working
    in a industrial chem. lab, we had a simple metal tube that screwed on
    to a standard spigot. It had a tube coming out at right angles which
    you could hook up to anything needing a vacuum, turn the water on
    full blast, and presto! 28in vac.  (a bit wasteful of water though).
    Some years later I bought a used , factory made vacuum casting table
    that worked on this principal.  It had a hose that you screwed on to
    any spigot.  I tried it, and it will pull a good vacuum.  It has a
    pretty small bell jar though, one flask at a time. 

    I'm sure that lab supply houses still probably have the spigot
    attachment I mentioned. Shouldn't cost much either. Bob 
    Robert Wise Studio

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