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Re: [ARSCLIST] stability of shellac disks



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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