[Amps] 5 Minutes for Ameritron 811H to warm up?

[Kim Elmore]

The "glass isn't a solid" is, apparently, a myth.  For example, 
http://math.ucr.edu/home/baez/physics/General/Glass/glass.html wheich 
ends with " The use of the term "supercooled liquid" to describe glass 
still persists, but is considered by many to be an unfortunate misnomer 
that should be avoided.  In any case, claims that glass panes in old 
windows have deformed due to glass flow have never been substantiated.  
Examples of Roman glassware and calculations based on measurements of 
glass visco-properties indicate that these claims cannot be true.  The 
observed features are more easily explained as a result of the imperfect 
methods used to make glass window panes before the float glass process 
was invented."

Also, there's 
http://dwb.unl.edu/Teacher/NSF/C01/C01Links/www.ualberta.ca/~bderksen/florin.html 


http://www.scientificamerican.com/article/fact-fiction-glass-liquid/

http://chemistry.about.com/od/matter/a/Is-Glass-A-Liquid-Or-A-Solid.htm

And finally, from Dow-Corning:

http://www.cmog.org/article/does-glass-flow

Kim N5OP


On 1/24/2015 10:38 AM, donroden at hiwaay.net wrote:
> I just went out and measured a 100 year old pane of glass on my 
> grandfather's shop.  No appreciable thickness change from top to bottom.
>
> I wouldn't spend to much time watching for glass flow.
>
> Don W4DNR
>
>
>
> Quoting greg greene <greg.greene74 at gmail.com>:
>
>>>
>>>
>>>
>>> Actually, there is something wrong with that. Glass, technically, is a
>>> liquid and flows very slowly under pressure, even at room temperature
>>> over long periods of time. I believe this is the main reason glass
>>> tubes are prone to become gassy after years of storage. I can't prove
>>> it, but I believe this is why ceramic tubes are much less prone to
>>> this problem since ceramic is a rigid crystalline solid.
>>>
>>> That's just my theory - comments welcome.
>>>
>>> Bill W6WRT
>>>
>>> *************************************
>>>
>> You are correct Bill, if you exam glass windows that are several 
>> years old
>> you will find the bottoms thicker than the tops from the flow of the 
>> glass
>> due to gravity.  Add heat from using the tube to accelerate the 
>> process and
>> one can see how glass tubes could be more prone to failure than ceramic.
>> I'm not aware of the formula for the glass used in tubes off shore 
>> but we
>> can hope they are taking this into account when they manufacture 
>> them, but
>> probably not.
>>
>> Greg VE7GPG
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>
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-- 

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"In theory there is no difference between theory and practice. But, in 
practice, there is." //– Attributed to many people; it’s so true that it 
doesn’t matter who said it./