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Article #17

Re: Nature of Glass

#17
From: Christopher Scanlan
Date: Thu, 29 Oct 1992 18:32
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I missed the top half of your article on sci.materials, but I assume
you were talking about glass flow in windows.  In older buildings
you see that windows are wavy and are thicker on the bottom.
According to my ceramics professor, this is simply because that is
how window glass was made when these buildings were built.  The
panes were made 2 at a time with thier bottoms touching in the "mold".
The glass was separated in the middle and both resulting
plates of glass were thicker near the bottom.  If you actually
work out the calculations for how long it would take for glass
to flow to this extent it turns out to be several centuries.
Therefore, it seems more reasonable that the windows were
simply made wavy and tapered.  I'm not an expert on this, so if
I'm wrong let me know.  I'm just telling you what I remember from
my ceramic materials class.

*****************************************************************************
|  Chris Scanlan                        | One should not try to speak       |
|  Materials Science and Engineering    | more clearly than one thinks.     |
|  University of Wisconsin - Milwaukee  |                                   |
|  nuke@csd4.csd.uwm.edu                |       - A. Whitehead              |
-----------------------------------------------------------------------------
|  TRIANGLE FRATERNITY * Architects * Engineers * Scientists                |
|  ASM International    Materials Engineers                                 |
*****************************************************************************
-- 

Rob Vaughn, Fugitive Systems Guy
Mat. Sci. Center Computing, Cornell University
rob@msc.cornell.edu - rob@crnlmsc2.bitnet
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From: nuke@csd4.csd.uwm.edu (Christopher Scanlan)
Newsgroups: sci.materials,alt.folklore.urban
Subject: Re: Nature of Glass
Message-ID: <1992Oct29.183244.11883@msc.cornell.edu>
Date: 29 Oct 92 18:32:44 GMT
Article-I.D.: msc.1992Oct29.183244.11883
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