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" <[email protected]>
Sent: Monday, June 15, 2009 4:17 PM
To: "Dave Carlson" <[email protected]>; "Discussion of precise time
and frequency measurement" <[email protected]>
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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