Re: [ATM] How far from the telescope should an artifical starbeplaced

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

He explained it, but I didn't quite understand it,
even though I asked him to re-explain it, and he did.
Unfortunately, I had my hands very full at the moment
with pouring a pitch lap (and he was rather critical
of my methods, too).
What he said was that if you are inside of the focus,
then the parts of the mirror that are **** will throw
too much light and you will see ****, but if you are
outside of the focus, then the parts of the mirror
that are *** will throw too much light and you will se
****. The reason I wrote the apostrophes is that I
didn't quite 'get it'.

Guy

--- Vladimir Galogaza <vladimir.galogaza@zg.htnet.hr>
wrote:

> >He never bothered learning how to do the Foucault
> or Ronchi tests
> > or any variations on that. He had a fairly easy
> way (for him) to tell 
> >what part of the mirror needed work based on where
> the 
> >out-of-focus lines were bright or dim, and
> depending on
> > whether he was inside focus or outside focus
> And I wander how come that after his visit to atm
> club mentioned above
> nobody asked him about details of this apocryphal
>  "fairly easy way (for him) to tell what part of the
> mirror needed work"
> in order to make his method available to mases. 


Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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