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Re: Hourglass Question

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On 9/4/2017 3:59 PM, Ron Hardin wrote:
> An old question from the 1970s that I never
> figured out.
> 
> What governs the speed of flow of an hourglass?
> 
> I mean what principle.  What's going on.
> 
> It's not viscosity (no transport of x momentum in
> the y direction etc.)
> 
> It seems like it's the time it takes something to
> call out of a lockup condition and clear the mess,
> leaving it up to the next lockup condition, but
> what the hell equation is that?
> 

what type of sand ?

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Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-04 16:59 -0400
  Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-04 17:53 -0500
  Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-05 13:44 -0700
    Re: Hourglass Question benj <benj@nobody.net> - 2017-09-05 19:34 -0400
    Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:22 -0700
      Re: Hourglass Question benj <benj@nobody.net> - 2017-09-06 18:21 -0400
        Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 18:18 -0500
      Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:35 -0700
      Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-07 13:06 -0700
        Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-07 16:44 -0500
          Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-08 13:34 -0700
            Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-08 15:53 -0700
              Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-08 17:36 -0700
              Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-11 14:41 -0700
            Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-09 13:31 -0700
              Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-09 14:32 -0700
  Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 14:39 -0400
    Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 14:01 -0500
      Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 18:36 -0400
    Re: Hourglass Question jimp@specsol.spam.sux.com - 2017-09-06 19:26 +0000
  Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:35 -0700
    Re: Hourglass Question Edward Prochak <edprochak@gmail.com> - 2017-09-06 15:32 -0700
    Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:44 -0700
  Re: Hourglass Question "nuny@bid.nes" <alien8752@gmail.com> - 2017-09-06 15:50 -0700

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