Re: [PSUBS-MAILIST] Sub as panoramic film platform

[Marc de Piolenc <piolenc@archivale.com>]

I am duly cautioned. I would point out, however, that your point about 
"glass" referring to a wide range of materials is correct, and emphasize 
that your points about "common" glass refer to the cheapest grade of 
window glass ONLY.

My father, who spent his professional career in glass, plastics and 
ceramics, once took me to the Corning Glass museum in upstate New York, 
where I saw among other things a pane of Herculite glass being flexed in 
a special fixture that gave it a bow of about 1/5 its length, then 
relaxed it to near straightness, then bowed it again, continuously. This 
taught me that it is possible to get decent extension-to-failure in a 
glass, and that fatigue is not an issue in that case.

So I just thought I'd ask.

Marc

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On 9/26/2010 1:27 PM, Jon Wallace wrote:
> Only acrylic should be used in human occupied submarines, and without
> exception. Please be cautious with this discussion so that we do not
> give readers the impression that glass can be considered a replacement
> for acrylic.
>
> In one sense the word "glass" is somewhat meaningless in the context
> you've presented it since there are many mixtures of glass which provide
> different properties. The structural properties for common glass are
> much less than for acrylic which makes it an inferior material. Its
> worst property is the lack of yield, or elasticity. As Ian stated,
> common glass is not as transparent as acrylic and it also takes on a
> green tint as it gains thickness; and it is very laborious to machine.
> Glass offers no benefit to small PVHO submarines.
>
> The Trieste used acrylic conical shaped viewports when it traveled to
> the deepest part of the ocean.
>
> Jon
>
>
>
> On 9/25/2010 11:55 PM, Marc de Piolenc wrote:
> > What about glass? To what extent can glass be substituted for acrylic
> > glazing, and what changes have to be made to the mounting arrangements?
>
>
>
>
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