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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