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 Hi All, 
              
I've finished viewport flange # 1 and am now moving on to flange #2 , this 
next one will be done here at home on the new lathe !!  so far the chips 
have been flying very well.     
My lenses on those 8 will be 1.5" thick by 6" dia and they are flat 
lenses. 
  All 8 viewport flanges in the "conning  tower"  will 
be the same,  7.5"  od .  I'm planning on two other 
viewports also, one in each of my two hatches.  My question is if I make 
those viewports with a conical acrylic lense can the acrylic be thinner ?  
I would like to have a lower profile for the hatch viewports.  Does anybody 
know the strenght comparison between the two types of lenses for similar sized 
viewports? 
Thanks 
Brian, Ventura, CA 
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