OT glass as a liquid ( Re: Direction follower ? Water jet

I have heard that glass 'could' be termed a liquid, but that in
actual fact, when glass was made, way back when, the installers just
put the thick side down as it was a better support.

then years later, the wiz bang kids 'discovered' this phenonoma and
started the speculation, or possibly it was from a very liberal
interputation of and old German text. regardless, glasses are
amorphous solids. There is a fundamental structural divide between
amorphous solids (including glasses) and crystalline solids.
Structurally, glasses are similar to liquids, but that doesn't mean
they are liquid.

Glass will not heal nor pool, even after hundreds of years. and a
stress induced crack such as would be made by a glass cutter will
have the localized energy diminished or distrubuted over time so the
cut will not break clean after some time.

Dave

--- In CAD_CAM_EDM_DRO@y..., Bill Vance <ccq@x> wrote:
> On Fri Jul 19 16:05:46 2002, mayfieldtm, <mayfiet@i...> wrote:
>
> {snip}
>
> >One thing I learned when hand cutting glass with a wheel, always
lube
> >before each score and break as soon as possible. I'm guessing
Glass
> >must have a certain amount of self healing. An old score never
breaks
> >as nice. Try it.
> >
> >The lighter fluid trick and hot wire trick is great on large dia.
> >tubing.
> >
> >Tom M.
>
> Believe it or not, that's because glass is really a liquid. If you
take a window
> out of a really old house, you'll find that it's much thicker at
the bottom than
> it is at the top. Some old glass also shows rippling, for the same
reason. It
> _wasn't_ a manufacturing defect due to old techniques, like some
folks think.
>
> Bill
>
> --
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