Re: [ATM] RE: [atm_free] The zonal Foucault test is free ofinherentcorrection bias - some supporting graphs

[Ken Lowther <hermit@outofoptions.org>]

Quoting vladimir sacek <vlad@copper.net>:

> Steve,
>
> > Nothing has turned up in the simulations--Foucault performs nearly
> flawlessly. <
>
> I'd say that it is rather Foucault simulations performing nearly 
> flawlessly. Consequently, the Foucault also does but only under 
> condition fulfilled by the simulation, which is that the intensity 
> level in each of the two zonal openings can be precisely measured. 
> Something our eyes can't even come close to during the actual test. 
> Linfoot himself acknowledeges that, and states in the conclusion: 
> "The zonal settings are most accurately determined not by comparing 
> the brightness of the apertures (i.e. zonal openings) with the 
> knife-edge stationary, but by observing which darkens in advance of 
> the other as the knife-edge is brought across."
>
If my tester didn't rock a little bit it wouldn't be as useful. ;-)  
The shade of gray is not the only thing that I judge.  Nudging the 
tester you can determine if the two sides 'wink' the same.  It is not 
abnormal for me to spend 10 to 20 minutes per zone looking and judging 
that the two sides behave the same in every aspect I can detect.  
Movement is a key.  I have seen the light come in from the outside on 
both openings too.  I have always wondered about the folks that say 
they take a reading when both sides first start to darken. I was never 
comfortable with that method.  I think with my method I end up cutting 
all the way through so I see any difference at any point of the light 
cone being cut off.  Probably just a sign of obsession.

I live below the Great Lakes where we get lots of cloud cover so I have 
to get it as close as I can on the bench.

Ken

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