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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:[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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>