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From: rockwell@socrates.umd.edu (Raul Rockwell)
Newsgroups: comp.org.eff.talk,alt.privacy,alt.censorship
Subject: Re: Prodigy charged with invading users' privacy
Message-ID: <ROCKWELL.91Jun1175258@socrates.umd.edu>
Date: 1 Jun 91 22:52:58 GMT
References: <ROCKWELL.91May27224016@socrates.umd.edu>
	<1991May28.050807.18871@casbah.acns.nwu.edu>
	<ROCKWELL.91Jun1114428@socrates.umd.edu>
	<1991Jun1.172405.2877@casbah.acns.nwu.edu>
Sender: rockwell@socrates.umd.edu (Raul Rockwell)
Organization: Traveller
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In-Reply-To: mikea@casbah.acns.nwu.edu's message of 1 Jun 91 17: 24:05 GMT

Michael Atkinson:
   [responding to my post about CRT image radiation]
	   Several block radius?  Fairly trivial equipment?  In My
   Less Than Perfect Understanding, it was a less than 100 foot radius
   with some serious equipment.  Furthermore, if it is a couple of
   blocks, there are about 2000 other undergrads, with maybe 700
   computers between them, within a couple of blocks.  Interference
   might make it a bit difficult to read my text.

	   Does anybody have the info on this technology?

Yeah, well.. I pulled my numbers on range out of a hat.  Actual range
depends quite a bit on local conditions.

As for interference, various lensing techniques can "work wonders",
though there is a limit to what you can pack into your typical van.

Finally, a pure analog approach isn't going to do as well as something
"tuned" to the vertical refresh rate of your screen (building up an
image from a number of frames).

Raul Rockwell