Article View: sci.electronics
Article #8655Re: Do Halogen lamps need ballasts?
From: David G Metzger
Date: Sun, 02 Dec 1990 01:46
Date: Sun, 02 Dec 1990 01:46
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1557 bytes
In article <1197@inews.intel.com>, bhoughto@cmdnfs.intel.com
(Blair P. Houghton) writes:
>In article <1990Dec1.032426@envy.bellcore.com> karn@thumper.bellcore.com write
s
>:
>>In article <1147@inews.intel.com>, bhoughto@cmdnfs.intel.com (Blair P.
>>Houghton) writes:
>[...deformation ==> rupture...]
>>|> The oil doesn't "weaken the structure." You can
>>|> wipe it off.
>>
>>I don't think that's quite right. Quartz is used precisely
>>because of its very low temperature expansion coefficient.
>
>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.
David Metzger
metzger@cup.portal.com
sun!portal!cup.portal.com!metzger
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!uwm.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!apple!portal!cup.portal.com!metzger From: metzger@cup.portal.com (David G Metzger) Newsgroups: sci.electronics Subject: Re: Do Halogen lamps need ballasts? Message-ID: <36440@cup.portal.com> Date: 2 Dec 90 01:46:10 GMT References: <714@skipper.dfrf.nasa.gov> <1147@inews.intel.com> <1990Dec1.032426@envy.bellcore.com> <1197@inews.intel.com> Organization: The Portal System (TM) Lines: 28