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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