Path: utzoo!mnetor!uunet!portal!cup.portal.com!coconut
From: coconut@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: Library book detectors.
Message-ID: <4329@cup.portal.com>
Date: 5 Apr 88 05:49:26 GMT
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Where I went to school in California we had a system where bye passing a book
over a sensor it would make the sensing device not pick up the book.
We could then pass the bok back over it with a switch held down and if the
book then was  passwd through the detector it would sound off..
What I am curious of though is....The plastic detectors we used were made
of thin plastic and metal...If the sensors work by picking up a field produced
by the tag...How about just squeezing the darn thing so hard that it would
resonate on a differest freq//

Oliver@cup.portal.com