Re: [ATM] ronchi accuracy

[Dale Eason <atmpob@yahoo.com>]

See:
http://www.geocities.com/stressedglass/2003atm.html
in particular see image titled  "Mirror testing using
a double bounce technique" and the next image as well.
 The caption does not state it but they are looking
though a ronchi screen and looking for perfectly
straight lines when testing a perfect porabola.

Dale Eason

--- Guy Brandenburg <gfbrandenburg@yahoo.com> wrote:

> Do you have any photos of such a setup?
>   Guy B
> 
> Jan Bentz <jbentz@inreach.com> wrote:  For teaching
> purposes with a group of people nothing works better
> than 
> the ronchi test using a perforated flat.  No math,
> no looking for 
> fringes, and if all have the same mirror, alignment
> is easy.
> 
> Jan Bentz
> 
> 
> 
> 
> Guy  Brandenburg
> Washington, DC
> My home page:
>
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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