Article View: sci.materials
Article #17Re: Nature of Glass
From: Christopher Scanlan
Date: Thu, 29 Oct 1992 18:32
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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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!reed!batcomputer!lynx@msc.cornell.edu!rob 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 Sender: news@msc.cornell.edu Organization: Cornell-Materials-Science-Center Lines: 29 Originator: rob@snoopy.msc.cornell.edu Followup: alt.folklore.urban