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echo: atm
to: ATM
from: charlesmitchard{at}iinet.net.au
date: 2003-03-12 20:58:00
subject: RE: ATM optic alignment problem

To: atm{at}shore.net
From: Charles Mitchard 
Reply-To: Charles Mitchard 


Hi Tom,
I can think of no reason why not. Its what holds fish tanks together
against constant (often tonnage) pressure. I have seen a 4 foot tank full
with no bracing strips where the front sheet of glass bowed outwards by
about 5"- 6" This tank remained like that for years. Not one of
mine:-) it used to scare me every time I visited the shop. Eventually the
glass broke but the joints held.
Consider that the edges of the glass are in shear and tension and my 6'
long, 2' wide and 2.5' high full of water is over 12 years old and has no
corner bracing only front and rear panel braces to stop bowing. Its amazing
stuff.
Charles



>Could that concept be applied for secondary mirror alignment?  Would RTV
>silicone have strong enough resistance to constant tension as the
>compliant hinge?  (Bond strength?  Tensile strength?)
>
>Tom Krajci
>Tashkent, Uzbekistan
>
>
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I just got lost in thought. It was unfamiliar territory.

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