Re: [ARSCLIST] stability of shellac disks

[Aaron Luis Levinson <aaron.levinson@xxxxxxxxxxx>]

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
>
>
> ***********************************************************************
> ***
>
> Experience the British Library online at www.bl.uk
>
> Adopt a Book this season ! Help the British Library conserve the
> world's
> knowledge.  www.bl.uk/adoptabook
>
> ***********************************************************************
> **
>
> The information contained in this e-mail is confidential and may be
> legally
> privileged. It is intended for the addressee(s) only. If you are not
> the
> intended recipient, please delete this e-mail and notify the
> postmaster@xxxxx : The contents of this e-mail must not be disclosed or
> copied without the sender's consent.
>
> The statements and opinions expressed in this message are those of the
> author and do not necessarily reflect those of the British Library. The
> British Library does not take any responsibility for the views of the
> author.
>
> ***********************************************************************
> **