> A better > explanation<http://en.wikipedia.org/wiki/Glass#Glass_versus_a_supercooled_liquid>can > be found in the wiki > > On Tue, Jun 16, 2009 at 4:34 PM, Chuck Harris <cfhar...@erols.com> wrote: > >> J. Forster wrote: >> >>> Interestingly, I recently had dinner with an archeology professor, >>> interested in the Etruscan period. She had just discovered a flatish >>> piece >>> of glass i9n a dig, thousands of years old, and believes it was made >>> essentially like rolling out dough on a slab while red hot. >>> >> >> To me, it would seem that playing with a blob of molten glass in >> a fire, and spreading it out, or rolling it would be a more natural >> step in the progression of making glass windows than blowing >> a bubble. >> >> I would strongly expect that the earliest windows would have been >> made by rolling the molten glass flat like it was dough. >> >> Much later would have come the blowing of a cylinder, and flattening >> it out.
=========== Agreed. Also remember that in the early days, glass was more likely used to pass light rather than be of image quality. The ability to have light enter a room without an opening in the wall must have been near magical. -John ============= >> >> In any case, there is zero evidence that glass flows at room >> temperature. If it did, and 180 years was all it took for a window >> pane to become all wavy, and thicken at the bottom, all of those >> 10,000 year old glass artifacts would be shaped like the chewing >> gum blobs on a city sidewalk. >> >> -Chuck Harris _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.