[ATM] re: Reducing mirror weight by sandblasting

["Ellen Mackenzie" <mackenzieconsulting@sympatico.ca>]

I personally have had many architectural creations carved in tempered glass.
The process is the only way to work tempered glass. When I started this
about twenty years ago I was surprised that the temperer recommended the
process. One project I did reveals no change in the stress pattern revealed
with crossed polarizers. I would think a more important problem to tackle
would be the thermal calculations necessary in the creation of a pattern
which would not affect the figure of the mirror at equilibrium. Probably,
the thinner the glass the quicker equilibrium is reached. Major reduction of
mass close to the center would decrease deformation under load. An
interesting problem! I would be tempted to figure first and cover the
polished surface with a protective rubber peel-coat such as that used by the
glass carvers. It is a compound similar to that sold at automotive supply
houses for stone protection on gravel pans on autos.

						Ellen


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