glass cutting

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: glass cutting
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 3 Mar 1998 00:03:58 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu]
Sent:  Sunday, March 01, 1998 1:21 PM
To:  tesla-at-pupman-dot-com
Subject:  Re:  glass cutting

"Tempered safety glass is heat treated just like steel.  The glass is heated
in an oven to a certain temperature.  The glass comes out of the oven on a
rolling conveyor system and through a water sprayer system.  It takes
several sheets of glass to get the water sparyer adjusted accurately without
causing the glass to explode.  When the water is adjusted correctly it looks
like a fog blowing on the hot glass that turns into steam."

	Look up "Saint Rupert's drops",  They are made by dropping
molten glass into water.  When everything works OK you get a drop
of glass, highly stressed inside, and with a tail on it.  Breaking
the tail causes the thing to shatter.  Same principle, couple of
centuries earlier.

Ed

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