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[PSUBS-MAILIST] conical viewports



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