You can actually see that in some of the original windows in this place.
They would have been made prior to 1856. I attempted to take a picture but
can not get one where you can see the flow down. Initially, the glass was
not very smooth when new. After many years it does smooth out somewhat on
its own flowing with gravity.
Paul
WD8OSU
On Sat, Jan 24, 2015 at 9:58 AM, greg greene <greg.greene74@gmail.com>
wrote:
> >
> >
> >
> > 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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