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

[Jon Wallace <jonw@psubs.org>]

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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