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[bob ford <bobford79 AT yahoo.com>]

I remember my father and grandfather using a plumg bob for some different 
kinds of construction when I was young.  I don't remeber why trhey would have 
used a bob instead of a level

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--- On Sun, 11/30/08, VAN DELL JORDAN <vdjor AT yahoo.com> wrote:

> From: VAN DELL JORDAN <vdjor AT yahoo.com>
> Subject: Re: [Homestead] Stacked rock foundation
> To: bobford79 AT yahoo.com
> Date: Sunday, November 30, 2008, 1:35 PM
> --- On Sun, 11/30/08, bob ford <bobford79 AT yahoo.com>
> wrote:
> 
> 
> > Wow, those are very big rocks.  I was imagining a rock
> > version of concrete blocks like some houses in the
> deep
> > South sit.  Those look like they would be very heavy. 
> I
> > don't know how long mercury filled carpenters
> levels
> > have been around.  Or, how they could tell how they
> heaving
> > from the frost might affect the rock foundations
> > ......Thank's for the pic; I was imagining a
> complete
> > incorrect image ......................bobford
> > 
> 
> Medieval builders used a tee shaped lever that had a plumb
> bob.  when the the plumb bob hung exactly in the middle they
> knew it was level.
> When the Hohokam built Casa Grande, they poured water on
> the floor.  When the water failed to puddle that was level.
> I expect the builders of Roxann's house eye balled it.
> Van Dell