[ATM] Re: ATM Digest, Vol 6, Issue 26

[Bob Lombardi <boblombardi@cfl.rr.com>]

At 11:01 PM 6/19/2004 , you wrote:

 >Message: 13
 >Date: Sat, 19 Jun 2004 22:44:30 -0400
 >From: Michael Lindner <mikell@optonline.net>
 >Subject: Re: [ATM] Supplies I need
 >To: David Williams <dwilliams1128@earthlink.net>, atm@atmlist.net
 >Message-ID: <200406192244.31110.mikell@optonline.net>
 >Content-Type: text/plain; charset=iso-8859-1
 >
 >On Saturday 19 June 2004 06:32 pm, David Williams wrote:
 >> Does anyone know of a place on the internet for a new or used spider for a
 >> 24" outer diameter tube (sonotube) and the price for an elliptical diagonal
 >> (new or used on the internet) for a 20" mirror.
 >
 >There are a bunch of links to making or acquiring ATM supplies at
 >http://www.starastronomy.org/TelescopeMaking/Links/ The Amateur Telescope
 >Maker's Resource List is one of the best links there, but it doesn't seem to
 >be working. Does anyone know of a mirror (I recall there were a couple)?
 >


Thanks for pointing that out.  The regular home for my Resource list is

http://www.tfn.net/~blombard/

but that appears to be down this weekend.  I updated the list friday night 
and it was working then, so perhaps a server went down.  The TFN domain is 
the Tallahassee Free Net, and like all freenets I've ever heard of, is run 
for free by volunteers.  If it isn't working, try this link:

http://home.cfl.rr.com/bobnpam/index.html

I always update both links at the same time.  The risk with the second one 
is only that if I change ISPs (no plans to...) it might go away.  But any 
site can go away, as the TFN seems to be proving.

 >
 >I have bought several spiders from Gary Wolanski, and been very pleased with
 >them http://www3.bc.sympatico.ca/gwolanski/SPIDERS.HTM Protostar is another
 >good supplier http://www.fpi-protostar.com/diagmnt.htm These are not the 
only
 >two, but the first two that happened to pop into my head.
 >
 >As for secondary mirrors, what size? You didn't mention focal length, but
 >since your sonotube is 8' long, I'm assuming this is an f/4? If so, you 
could
 >get by with a 3.5" for visual use, up to a 4.5". Protostar sells diagonals
 >http://www.fpi-protostar.com/pyrex.htm as well as Antares
 >http://www.antaresoptics.com/SecEM.html and a bunch of other places. Again,
 >these are just the first two that popped into my head.
 >
 >> ...a program to show you how to
 >> lay out your mirror and diagonal and spider.
 >
 >Dale Keller's Newt program
 >http://home.att.net/~dale.keller/atm/newtonians/newtsoft/newtsoft.htm is 
what
 >you're looking for. Also Mel Bartels' diagonal calculator
 >http://members.efn.org/~mbartels/tm/diagonal.htm can help you choose a
 >secondary size...
 >
 >--
 >Michael Lindner
 >http://www.starastronomy.org *** http://home.att.net/~mikel
 >http://www.atmsite.org *** http://www.atmlist.net
 >
 >


Clear skies,
Bob
W4ATM



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