Xref: utzoo sci.electronics:8262 rec.ham-radio:14135
Path: utzoo!attcan!utgpu!watmath!iuvax!daemon
From: commgrp@silver.bacs.indiana.edu (BACS Data Communications Group)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: magnetometers
Message-ID: <28043@iuvax.cs.indiana.edu>
Date: 18 Oct 89 15:15:15 GMT
Sender: BACS Data Communications Group <commgrp@silver.bacs.indiana.edu>
Lines: 21


to sci.electronics and rec.ham-radio:

_Sky & Telescope_ October '89 published plans for a "Jam-jar 
magnetometer" useful as an aurora alarm.  A more advanced version of 
the same device appeared in the July 1988 issue of _The Lowdown_ 
(newsletter of the Longwave Club of America).  This one has a Hall-
effect sensor and amplifiers added, so that the compass deflections 
can be output to a chart-recorder.

See also _Electronics_ magazine, December 1980, p. 112 for plans of a 
Hall-effect magnetic compass with no moving parts.

Copies of the above available for SASE, and I'm sending them to WA4VLV 
re his request on rec.ham-radio.
--

Frank Reid     W9MKV @ K9IU     reid@gold.bacs.indiana.edu
P.O. Box 5283
Bloomington. Indiana
USA 47407-5283