Ok, I can't resist. Why whack your own mirror at all? Just talk you most gullible buddy into letting you whack his mirror. All in the name of science of course. Or buy a mirror, whack it, and if the figure changes send it back as defective!
Did I just say that..... I take it back, Go with John's advice. Just say no to whack.
Jack
-----Original Message-----
From: Doug Tanaka [SMTP:dtanaka@seanet.com]
Sent: Wednesday, March 14, 2001 1:04 PM
To: 'atm@shore.net'
Subject: RE: ATM (Whack Test)Plate mirror warnings
> If there were a brave soul in the group, they could try making say a 6
>inch plate glass mirror, polish it to a sphere, then give it a walloping
>good whack with a rubber mallet. Then test it again. That could be an
>interesting experiment.
What about hitting the plate glass before grinding begins? It would seem to me that if there was a question as to the integrity of the glass, this would answer it before any labor was wasted. If a bump was going to change the figure after figuring, perhaps it would do it before.
Doug Tanaka