Re: [ATM] [atm] how to test flat secondary mirror

["Donald Good" <donald.good@comcast.net>]

Phil,
Try a Chamois Cloth or some manmade substitute.  Chamois is made from
leather and does not shed fibers, etc. like plant (cotton) fabric.  An auto
or woodworking store should have it.

Don
-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
James Sturtevant
Sent: 29 September 2007 22:13
To: atm@atmlist.net
Subject: Re: [ATM] [atm] how to test flat secondary mirror

>The biggest problem I ran into was ensuring that the two plates under 
>test were totally free of dust. The tiniest spec of dust was skewing my 
>fringe patterns so much that I could never get two readings the same. I 
>haven't really cracked that problem yet, so if you have any ideas then 
>let
me know!
>
>Hope this helps,
>
>	Phil.

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