From: "Thomas Janstrom" 
To: "Bob May" 
Cc: "atm" 
Reply-To: "Thomas Janstrom" 


Bob, the piece is a 3"X1"X14" brick, I'm looking for a kiln
to have it recast in, I was planing on casting it in a graphite mold which
would pregenerate one curve. the procedure I was planning on using would
entail "slumping" the brick in one piece into the mold so as not
to get any bubbles in the glass. BTW thanks Stan for the slumping idea.
Clear skies, Thomas
http://www.tjanstrom.com
"Don't make me set the laser printer to stun"

----- Original Message -----
From: "Bob May" 
To: "atmlist" 
Sent: Tuesday, January 14, 2003 1:39 PM Subject: Re: ATM Corning optical glass


>
> The glass is listed in my list of B&L glasses as a crown glass with all of
> the various indices as needed to do a design.  It is somewhat close to K01
> in the OHara glasses as well but not exactly the same.
> Without the melt papers, the B&L numbers should do very nicely for a
> starting point to making a decent telescope.
> FWIW, I may be interested in the glass if it is 12" in diameter as I
already
> have a Flint and a Short Flint glass that may go decently well with it but
I
> haven't done a raytrace to find out if it really is right.
> If the glass is in the 8" diameter or a little less, I have a piece of DF4
> with a sharp curve in one side that you may find quite useful for making a
> decent doublet of fair quality.  The glass is 8 1/2" in diameter and is
> approx. 1" thick in the center and has a gentle convex on the other side.
> Bob May
> http://nav.to/bobmay
> bobmay{at}nethere.com
> NEW! http://bobmay.astronomy.net
>
>
>
>

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