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Re: [ATM] Good stuff

On Thu, 17 Jan 2008, Ken Hunter wrote:

> Here's 2 links for Lutfi,
>
>   The first is an index of atm related stuff of all types. The second is a great introduction to Focault testing.
>
>   http://www.atmsite.org
>   http://www.atmsite.org/contrib/Harbour/Foucault.html
>
>   Ken Hunter

Harbour's discussion is truly worth reading. I note that he states
that the mirror is divided into 5 equal area sectors where he
discussed zones, somewhere close to "fig A". I recall not agreeing
exactly with his numbers. I think I finally decided that if one
calculates r for areas that are 10,30,50,70 and 90 percent of
total area, then you get the numbers he states. Not a big deal,
but for a beginner it might be confusing.

Harbour also describes very nicely how to identify the various
zones using a modification of an Everest mask that seems like a
great idea. He also takes up some issues regarding errors in
testing relating this to the Airy disk.

Nice job!

Dominic

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