Re: [ARSCLIST] stability of shellac disks

[Rod Stephens <savecal@xxxxxxxxxxxxx>]

I'm beginning to think this whole discussion is a pane in the glass...

Rod Stephens
An innocent bystander.

Aaron Luis Levinson wrote:

> This thickening is due to the way pane glass was manufactured
> in the 19th century and earlier not due to its deformation as a
> super-cooled liquid.
>
> aa
> On Friday, January 30, 2004, at 09:55 AM, Bewley, Nigel wrote:
>
> > Okay...how do we account for window glass that has become thicker at
> > the
> > bottom of the pane than at the top?  Apparently glass 'flows' over
> > time -
> > years not weeks - and window panes change shape!
> >
> > Nigel
> > British Library
> >
> > -----Original Message-----
> > From: Don Cox [mailto:doncox@xxxxxxxxxxxxxx]
> > Sent: 30 January 2004 15:00
> > To: ARSCLIST@xxxxxxxxxxxx
> > Subject: Re: [ARSCLIST] stability of shellac disks
> >
> > On 30/01/04, Art Shifrin wrote:
> >
> > > "I have shellac records over a century old which exhibit no
> > > deterioration other than wear!
> > > Steven C. Barr"
> > >
> > > How do you know that the disks have not in some way changed or
> > > deteriorated?
> > >
> > > Yes, they're playable but even glass changes shape over time.
> >
> >
> > I saw an exhibition of Roman glass a few years ago. Those bottles etc
> > didn't show any signs of having changed shape over 2000 years.
> >
> > Regards
> > --
> > Don Cox
> > doncox@xxxxxxxxxxxxxx
> >
> >
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