RE: [ATM] Glass Types

["Thomas Janstrom" <tomjan@ozemail.com.au>]

Don't forget that the lead in leaded glass tends to be a bit more
transdermaly toxic than just plain lead. I don't know why this is so,
but it should be kept in mind when working with the stuff.

Regards, Thomas.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of Bob May
Sent: Wednesday, 20 July 2005 4:18 AM
To: atm@atmlist.net
Subject: Re: [ATM] Glass Types

The type of glass isn't important at all.  The important thing is the
finish
that glass can obtain with proper polishing.
I will note that lead glass is a bit more brittle than ordinary soda
lime
plate glass so the grinding will go a bit faster but the glass will also
be
more jubject to severe cracking from rough handling.
Also, due to the higher coefficient of expansion, the finished mirror
will
also go further out of shape under changing temp conditions thus making
a
scope that will be a little more difficult to cool down.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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