17 Feb
2012
17 Feb
'12
4:52 p.m.
The porthole glass arrived today and looks like it could make a great mirror. A shallow chip on one face that will obviously be the backside. For less than thirty bucks, I think I got a deal. It would also make a terrific tool, providing one doesn't "pull a Brent". ;-) I recently found in long-term storage a 12.5" full-thickness Pyrex blank, and I think I have a 16" plate-glass blank around here somewhere that's at least 3/4" thick. I sold a few small blanks to Jay last month but the big stuff is still hidden in either my basement or mom's garage. I shouldn't even think about grinding another mirror, at least for a long time yet. I have at least a dozen finished mirrors that need to have a telescope built around them first.