Print 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!

British Library

-----Original Message-----
From: Don Cox [mailto:[log in to unmask]]
Sent: 30 January 2004 15:00
To: [log in to unmask]
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.

Don Cox
[log in to unmask]


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