but why is it always thicker at the bottom?
I thought it was from slow creeping of a super cooled liquid (glass)


Eric Hammarberg
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Sr. Associate
LZA Technology
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-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, August 26, 2003 9:29 AM
To: [log in to unmask]
Subject: Re: Folk history question II


"So have you heard the one about old window glass being thicker at the
bottom edge because glass is actually a liquid affected by gravity?
True or nutso?"

I've heard that before, but I was generally under the impression that window
glass was thicker on one side than the other because of the way it was
processed. Cones of glass were rolled out in a circular pattern-- the glass
on the edge rolled thinner than the glass in the center; thus, early window
glass tends to be thicker on one side than the other.

This seemed borne out by the marks in the glass where I used to work (c.
1750 farmhouse). All the early glass was rippled in slightly curved waves.

-Heidi

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