[ATM] A foucault image quiz Part 1.

[David Harbour]

Looks allright to me, Dave-

R-101

----- Original Message ----- 
From: "David Weinshenker" <daze39 at earthlink.net>
To: <atm at atmlist.net>
Sent: Wednesday, April 09, 2008 10:57 AM
Subject: Re: [ATM] A foucault image quiz Part 1.


> Dale Eason wrote:
>> See:
>> 
>> http://www.atmlist.net/contrib/atmpob-at-yahoo-dot-com/foucault425a.jpg
> 
> I don't know how much is due to the test setup, but there seems to be an
> odd asymmetry about this one: a paraboloid tested at center of curvature
> shows a shadow pattern that can look like an obliquely lit bagel - here,
> it looks like the bagel shape was shifted to the left and the right side
> was inflated to fill the circle.
> 
> Since the apparent shadow surface is supposed to represent the deviation
> from the sphere, it almost looks like the "correction" was decentered
> relative to the basic "curve" - that the "parabolizing" process left a
> different curve shape on one side than on the other...?
> 
> Or am I just "jumping at shadows" here?
> 
> -dave w
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>