🚀 go-pugleaf

In article <1708@seqp4.sequoia.com> John Curtis,
jcurtis@seqp4.sequoia.com writes:
> When is enough?  Any hints?   I haven't used my Foucault apparatus on

Take the mirror, and sprinkle little powdered sugar on it, and examine it
under
a good microscope.  When you are done polishing, you will see no pits at
300X.
The best places to look are .25" from the bevel, the center, and the 50%
zone.
Why the powdered sugar?  When a mirror is close to done, it is sometimes
hard
to focus the microscope on the surface, and sometimes one touches down
with the
microscope objective and damages it or the mirror.  The powder washes off
easily,
and helps you find the surface.

Of course, sometime one finds really big pits that were not removed in
fine
grinding.  Then it is up to you conscience...

-Ben Burch