Re: Foucault test limitations was [ATM] (no subject)

["Geoff Nelson" <gjnelson@absamail.co.za>]

I meant the inability of the tester to gauge the zone. If we remove 
can remove the human interpretation would the accuracy be in the 
region always of 1/40th wave or 1/100th wave. If I moved to the image 
based reduction of the test would I get rid of my lack of skills and 
so be in a better position to judge what is happening to the mirror.

From:           	"Bob May" <bobmay@nethere.com>
Subject:        	Re: Foucault test limitations was  [ATM] (no subject)
Date sent:      	Thu, 13 May 2004 08:59:06 -0700
To:             	"atml" <atm@atmlist.net>

> What do you mean by errors?
> The biggest error in the Foucault test is the inability of the average
> tester to be able to match the shadows correctly and get the right COC
> for the zone. All the rest of the error sources, the ones that are
> sort of inherent in the test, are all down in the 1/100th wave and so
> forth, an area where it is difficult to even consider for anybody as
> the test usually tops out in the 1/40th of a wave because of the
> readings granularity. Bob May http://nav.to/bobmay bobmay@nethere.com
> NEW! http://bobmay.astronomy.net
> 
> 
> 
> 


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