Re: [ATM] David Davis's ultrathin surface revealed in stunning3Dtechnicolor

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

Dale,

judging from the images of your mirror cell, I get the impression the mirror
rests with edge against the plastic cylinder. I suspect that if so,
particularly but not only, there is friction between edge and peg and
depending on how the mirror was seated against the edge, there may be
inadvertent bending forces in action. These may not be very reproducible
from one measurement to the next.

What I would suggest is a cylinder with its axis parallel to the plane of
the mirror, freely moving (ball bearings?) something a little like:
http://web.telia.com/~u41105032/bilder/ballbear.jpg
resting against the mirror at the level of the COG, at least approximately.
This will ensure next to no bending force - I think, at least, and give not
only less but also more reproducible test stand errors.

Provided, of course, that the mirror's edge is reasonably cylindrical - I'm 
not sure this is so with this particular specimen.
Nils Olof




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