ATM Ronchi Tests, How?

[Christopher Kovacs <ckovacs@netcom.com> (by way of Mel Bartels <mbartels@efn.org>)]

Hi all,

I been sitting back in the woodwork here.  I am poking my head out to
ask some newbie questions...

I am in the process of making my first mirror.  I am using Berry's book
along with Texereau's book.  No where have I found any references to using
the line Ronchi gratings and how to setup for these tests.  

What is the easiest may to setup a Ronchi test?  I have a 135 line per inch
grating and not clear how to use it.


                        Thanks in Advance,

                                Chris