Re: ATM Ceramic Tools

[Bob Madden <madden@netcom.com>]

Randy, he is Dave Barosso, Linden Ca, 209-887-2106 (last number I had for 
Dave). I would think porcelin would be harder than glazed ceramic. It is 
my gut feel too. My last 5.5-inch was ground to the pitch stage with no 
scratches whith each on top at times. I was very careful in cleaning the 
gaps between grit changes - lotsa water and tooth-brushing. It seems to 
me "old wive's tales" get started and passed around and we shy away from 
doing things. I sort-of have that problem with bonding normal thickness 
secondaries in place. The talk of sillycon sag when the scope is moved 
over center. With my eyesight I'd really be in trouble. NOTOH, If I were 
making some precision astrometric measurements with a precession 
instrument, I wonder about the errors................

Friendly Bob

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