[ATM] Fine Grind already Blanchard ground mirror blank back?

["Bob Drew" <gofast3@hotmail.com>]

I checked with the optician who figured my 32? and had actually first 
polished (not just fine ground ) the mirror back flat, before figuring.

He said he adopts that process for a few reasons. First, it would prevent 
the mirror from sticking to or binding to the cell support points. ( Delrin 
hemispherical ). He was of the view that polishing the back may release any 
surface strain from the Blanchard ground back.  Also, polishing the mirror 
back might possibly improve long term stability, as there might possibly be 
an effect   if the finish of two surfaces of the mirrors differed.

And lastly, it looks good.  : )



Bob

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