RE: ATM Lerning to read ronchigrams.

[Mike Warne <mwarne@pihana.com>]

Hi Steven,

I looked at my first ronchi test last evening, so I can't help there...

  But I also built a tester using the Stellafane plans.  Isn't it a moving
source tester?  The light moves together with the Ronchi or Knife Edge
because they are both mounted on the movable stage.  From what I understand,
it will be important to know if your tester's light source is fixed or moves
with the knife edge,  when it comes time to do your figuring calculations...

Mike Warne.

-----Original Message-----
From: Steven LaBrenz [mailto:srlabrenz@hotmail.com]
Sent: Tuesday, June 05, 2001 4:36 PM
To: atm@shore.net
Subject: ATM Lerning to read ronchigrams.



Hello all,

I am attempting to finish a mirror started by my father-in-law 25 years ago 
and have successfully, well, set the project back 30 years.  I have a basic 
setup at home and have built my own fixed source foucault tester with a 100 
line per inch grating (ala Stellafane web site).

Does anyone have a reading suggestion for learning to read ronchigrams?  
They seem simple, which makes me fear I could interpret them wrong.

Steven LaBrenz
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