Article View: sci.electronics
Article #8686Re: Do Halogen lamps need ballasts?
From: Adam David
Date: Mon, 03 Dec 1990 14:26
Date: Mon, 03 Dec 1990 14:26
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1352 bytes
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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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!bloom-beacon!eru!hagbard!sunic!isgate!krafla!adamdReferences:
<714@skipper.dfrf.nasa.gov> <1147@inews.intel.com> <1990Dec1.032426@envy.bellcore.com> <1197@inews.intel.com> <36440@cup.portal.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!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