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[PSUBS-MAILIST] Portholes, Windows



I've been trying to make windows for my ROV's camera to look out of, I'm using acrylic and am pouring that into a mold for the window shape. The window is 2cm in diameter and 2mm thick. I need to keep it thin or it distorts the camera image. It's also flat, no dome shape (I couldn't figure out how to get a nice smooth dome... although now I have quite the collection of odd shaped tiddly winks if anyone's interested)
Problem is the things are so brittle I don't think they'll stand up to much preasure.
 
Am I missing something here?