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Re: Hour Glass
Posted by James on 2/11/08

    Here's what I found:

    "Two globes (also called phials or ampules) of glass are
    connected by a narrow throat so that sand (with relatively
    uniform grain size) flows from the upper globe to the lower."

    Source:
    http://www.madehow.com/Volume-5/Hourglass.html

     
     

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