Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!bloom-beacon!eru!hagbard!sunic!isgate!krafla!adamd
From: adamd@rhi.hi.is (Adam David)
Newsgroups: sci.electronics
Subject: Re: Do Halogen lamps need ballasts?
Message-ID: <2473@krafla.rhi.hi.is>
Date: 3 Dec 90 14:26:39 GMT
References: <714@skipper.dfrf.nasa.gov> <1147@inews.intel.com>   <1990Dec1.032426@envy.bellcore.com> <1197@inews.intel.com> <36440@cup.portal.com>
Organization: University of Iceland
Lines: 23

In <36440@cup.portal.com> metzger@cup.portal.com (David G Metzger) writes:

>In article <1197@inews.intel.com>, bhoughto@cmdnfs.intel.com
>   (Blair P. Houghton) writes:

>>Very low != nonexistant.  Also, quartz is very brittle.
>>Any deformation causes catastrophic displacement
>>(cleaving).  When there's a uniformity of heat
>  ^^^^^^^^
>>distribution, things expand normally.  When there isn't,
>>they don't.

>     Quartz does not have cleavage planes.  When quartz breaks, it
>is by conchoidal fracture.

Depends on how it grew doesn't it? Defects in the crystal can form very regular
fracture planes that behave just like cleavage planes. This weak area is the one
most likely to break if the deformation occurs nearby. But then again, there
aren't supposed to be any defects are there?

Adam David.

adamd@rhi.hi.is


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