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From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: net.med,net.info-terms
Subject: Re: VDT's and eyes -- and ears.
Message-ID: <177@hadron.UUCP>
Date: Tue, 7-Jan-86 00:23:31 EST
Article-I.D.: hadron.177
Posted: Tue Jan  7 00:23:31 1986
Date-Received: Wed, 8-Jan-86 20:13:40 EST
References: <341@weitek.UUCP> <642@ttrdc.UUCP> <755@brl-tgr.ARPA>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Organization: Hadron, Inc., Fairfax, VA
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Xref: linus net.med:2931 net.info-terms:329

In article <1260@brl-tgr.ARPA> gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) writes:
>By the way, the fellow who got headaches in the room full of burning-in
>monitor assemblies was probably being affected by the near-ultrasonic
>sound generated by the horizontal circuits (often transformer laminations
>vibrating).  Even if he didn't consciously hear them, such whistles would
>lead to irritability and headaches.

I can hear them!  (usually.)  And also the cheap security TV cameras
and TV's and sonar burglar alarms and traffic light detectors.  How
common is this phenomenon?  When I've mentioned it, most people are
surprised or doubtful; a few are surprised that everyone doesn't.
-- 

	Joe Yao		hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}