Re: [ATM] Foucault Slit

[Mark Cowan <toolontop@yahoo.com>]

Hi Rich:

There's both a "too narrow" and a "too wide" but I use
50 microns (.002") by experimentation and find it
recommended elsewhere. I have some brass shim stock
that thickness.  For common everyday items:  Reynolds
standard aluminum wrap measures exactly .001" by my
micrometer so fold it over and you're set.

Cheers,
Mark Cowan
Salem, OR USA 

--- Rich Ball <ShooterBall@hotmail.com> wrote:

> Is there any common object that can be used to
> calibrate the slit-width on
> the Foucault light source?  Should it be as wide as
> a the cover on a book of
> matches?  (Too wide, I think.) As wide as a standard
> pin?  As wide as the
> shaft of a push-pin?  etc. etc.  How wide is too
> wide?  I suppose there is
> no "too narrow."
> 
> Thanks for thoughts on this.
> 
> My tester has a slit formed by 2 single-edged razor
> blades held in place top
> and bottom by tinnerman nuts.  It's easy to adjust. 
> I just don't have clear
> idea of what it should be.
> 
> --Rich Ball
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> ATM mailing list http://www.atmlist.net/
> 



		
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