Re: [ATM] 4.5"x 3/4" Pyrex disks at Surplus Shed and Acculap

["David Harbour" <scarab2@cox.net>]

Curtis,

There is a record in an old Sky and Telescope magazine (I forgot what year)
that recounts a man doing his very first effort: a 20" mirror!!!

Although he said he made many mistakes, in the end he had a near perfect
optic. The article showed a focograph that seemed near perfect to me (knife
edge set to null the .7071 zone).

Read my article, for confidence, and then, do whatever size you want to. I
believe the record is a 36", for a first mirror, by Ritchey's "mentor"
Andrew Ainslee Common. Here is a link to my article:

http://www.atmsite.org/contrib/Harbour/Foucault.html

Mirror making is 99 % inspiration, and one percent perspiration (I'm not
kidding). In other words, get all the concepts clearly in mind, and the rest
is just donkey work. You will love it!

Dave

----- Original Message ----- 
From: "Curtis Spivey" <curtis.spivey@gmail.com>
To: <atm@atmlist.net>
Sent: Thursday, June 09, 2005 12:53 AM
Subject: Re: [ATM] 4.5"x 3/4" Pyrex disks at Surplus Shed and Acculap


I'm new to the list and I don't own a telescope.  I am considering
buying a $5 blank from the site and giving it a try.
http://www.surplusshed.com/pages/item/l3357.html

Is it worth the effort for a first scope?  Or should I start with
something bigger?  I don't have any mirror making supplies so, I'll be
doing this from scratch (no pun intended).

Curtis
Nampa, Idaho
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