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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!js2j
From: js2j@mhuxt.UUCP (sonntag)
Newsgroups: net.physics
Subject: Re: The membrane cup PMM
Message-ID: <741@mhuxt.UUCP>
Date: Tue, 9-Apr-85 13:02:27 EST
Article-I.D.: mhuxt.741
Posted: Tue Apr  9 13:02:27 1985
Date-Received: Wed, 10-Apr-85 05:39:46 EST
References: <1501@decwrl.UUCP> <119@bbnccv.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 19

> Like the original poster of this problem, I have never heard a
> satisfactory (to me) explanation of this PMM.  I encountered it long
> ago in a high school physics class; in fact, I was just describing it
> to some of my coworkers in the hall, and then it appeared here!  If my
> friends come up with the answer, I'll post it.
> /jr

       Could someone repost or mail me a description of the membrane cup
PMM?  I seem to recall that it was about a chain of containers half-full
of water with a rubber membrane stretched across the opening. The chain
of cups was placed in the water so that on one side of the chain the cups
were inverted.  That's all I can remember of the explanation, but there
must be more, because there's obviously no reason to expect the system
I described above to move at all, let alone perpetually.
-- 
Jeff Sonntag
ihnp4!mhuxt!js2j
    "You're from Joisey?  I'm from Joisey!"
    "Which exit?"