Re: [ATM] WAS Magnalium....

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

As per my earlier post, Cary,

Try autocollimation with a pan of quicksilver or oil. Has everyone forgotten
this method? It is idiot-proof, as are all tests based on autocollimation.
And, THERE IS NOTHING TO CALCULATE, once figuring has begun. Null figuring
is wonderful; you don't even have to know arithmetic (basic arithmetic) to
null figure. (You will need to finish primary first, of course). G.W.R's
favorite method; but he was talented enough to produce a big flat instead of
having to mess around with oil or mercury.

Dave

----- Original Message ----- 
From: "Cary Chleborad" <Cary@Chleborads.com>
To: <atm@atmlist.net>
Sent: Friday, May 06, 2005 5:19 PM
Subject: [ATM] WAS Magnalium....


>
> So...
>
> All complete foolishness aside....  anyone have any good, convenient,
> QUANTATATIVE, and PRACTICAL solutions for testing convex Cassegrain
> secondaries?
>
> -Cary
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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