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From: FISCHER@RUTGERS.ARPA
Newsgroups: net.physics
Subject: Car detectors with "horns"
Message-ID: <14203@sri-arpa.UUCP>
Date: Thu, 1-Dec-83 04:11:59 EST
Article-I.D.: sri-arpa.14203
Posted: Thu Dec  1 04:11:59 1983
Date-Received: Sun, 4-Dec-83 06:01:39 EST
Lines: 9

From:  Ron <FISCHER@RUTGERS.ARPA>

How about just ultrasonics?  Certainly cheaper than microwave for that.

Take your dog, cat, or other transducer there and see if you get a
reaction.

(ron)
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