To: "Herb Kasler" 
Cc: "ATM list" , "Michael Burr"
,
        owner-atm{at}shore.net
From: Hugues.Laroche{at}ses-astra.com
Reply-To: Hugues.Laroche{at}ses-astra.com



Hi Herb,

>The wire (or hair) has to
>be just big enough to cover the
>image of the slit. It creates a shadow that
>looks like a Greek letter Phi,
>that is, when everything is lined up just
>right.

Very nice pictures of this (among other things) at

http://www.group70.org

and more precisely

http://www.yankee.us.com/daniel/personal/photos/group70/index-small.html

Hugues




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