"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
--
To terminate puerile preservation prattling among pals and the
uncoffee-ed, or to change your settings, go to:
<http://maelstrom.stjohns.edu/archives/bullamanka-pinheads.html>