[time-nuts] Lifetime of glass containers

[jmfranke]

Also, people have noted that old glass window panes from the colonial era 
are thicker at the base than the top.  This was due to the glacier selecting 
the orientation of each piece.  Otherwise the prism effect would break up 
horizontal lines viewed through the panes.  We did the same with segmented 
precision glass windows used in wind tunnels at NASA.  Ancient glass bottles 
with chips or broken sections still have sharp edges.

John  WA4WDL

--------------------------------------------------
From: "Chuck Harris" <cfharris at erols.com>
Sent: Monday, June 15, 2009 4:17 PM
To: "Dave Carlson" <dgcarlson at sbcglobal.net>; "Discussion of precise time 
and frequency measurement" <time-nuts at febo.com>
Subject: Re: [time-nuts] Lifetime of glass containers

> That's just it, the glass wasn't flat to begin with.
> Early glass was poured out into sheets, and was quite
> non uniform in thickness.
>
> -Chuck Harris
>
> Dave Carlson wrote:
>> Not to charge in, but I've looked at ordinary window pane glass in very 
>> old buildings and you can actually see the rippling effect that occurred 
>> over time, showing the "flow" of the glass toward the lower edge of the 
>> pane. One presumes that the panes were relatively uniform when installed 
>> 120 years earlier. Sounds liquid to me.
>>
>> Dave
>
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