Date:         Fri, 30 Jan 2004 10:14:03 -0500
Reply-To:     Association for Recorded Sound Discussion List
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Sender:       Association for Recorded Sound Discussion List
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From:         Aaron Luis Levinson <[log in to unmask]>
Subject:      Re: stability of shellac disks
Comments: To: Association for Recorded Sound Discussion List <[log in to unmask]>
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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:[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.
>
> Regards
> --
> Don Cox
> [log in to unmask]
>
>
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