[ATM] Additional phase contrast and Foucault images

[Dominic-Luc Webb]

> I did some experiments by simulation....

Hi again Stephen.

In a sense we are opposites; I have not done simulations, but I
do have practical hands on experience with phase contrast
imaging (about 20 years). Since I am in the coming weekend or
two needing to set up my Foucault tester, maybe even more valuable
than those nice pics (Stephen) just provided would be a pic or two
of the actual rig from the poster (Dale?) that showed that pic
with the multiple mirror images, and I can see what I can do with
it? Not sure I'll have a comparable parabola (after all, I had a
reason for setting up my tester, like checking a surface I'm working).

Dominic-Luc Webb