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I'm guessing here, but I would think in this day and age, modern porthole glass would probably be built up and laminated. Maybe 4 x 6mm pieces, or 2 x 12 for a 25mm overall thickness. Has anyone tried using laminated glass for a mirror? Or would the lamination break down in the aluminising process?
I have read that it is quicker to make a 6" mirror and then a 10" mirror, than to make a 10" mirror as a first effort. The learning curve on a 6" mirror is quite gentle, but on a 10" it is very steep. I have never tried either.
As the depth of the curve on a 250mm mirror is only about 2.6mm (I think), there would be plenty of meat left in the front layer of glass. However, I only offer this suggestion for consideration and comment by others, and would not recommend it unless there is a positive reaction.
Regards,
Mike
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