Re: [ATM] Celestron 20" R-C telescope

["Stuart Hutchins" <stuart452@earthlink.net>]

After seeing the Anacortes pictures (link provided by Michael), this does
not look like a Serrurier structure.  Notice the Dec shaft appears to go
into the center of the lower truss, not the rings between the upper and
lower.  It simply looks like a box to connect the Dec shaft.

My, what a lot of metal way up in the air.

Stuart

----- Original Message ----- 
From: "Stuart Hutchins" <stuart452@earthlink.net>
To: <artbianconi@blast.net>; "ATM" <atm@atmlist.net>
Sent: Tuesday, May 04, 2004 2:17 PM
Subject: Re: [ATM] Celestron 20" R-C telescope


> Art,
>
> Serrurier truss?  Linear deflection at the cage equals linear deflection
of
> the mirror.  Pointing angle then does not change as the structure sags.
> http://astro.umsystem.edu/atm/ARCHIVES/JUL95/0114.html
> http://astro.umsystem.edu/atm/ARCHIVES/SEP03/msg00804.html
>
> Stuart


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