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Very cool, Len.<div>I may have seen one in a book I have.</div><div>I will have to look.<br><br><br><a href="https://overview.mail.yahoo.com/?.src=iOS">Sent from Yahoo Mail for iPad</a><br><br><p class="yahoo-quoted-begin" style="font-size: 15px; color: #715FFA; padding-top: 15px; margin-top: 0">On Wednesday, November 24, 2021, 9:36 PM, Lens Email via Thursday <thursday@newsm.org> wrote:</p><blockquote class="iosymail"><div dir="ltr">I picked up this Tangent Galvanometer used to measure electrical current. A compass belongs in the middle and it was used to compare the magnetic field generated by a unknown current to the magnetic field of the earth. This one was made by Knott Boston. This was used in the late 1800’s. Found a small replacement compass on eBay. Just looked neat and it was cheap so I bought it.<br></div><div dir="ltr"><br></div><br><br>Sent from my iPhone_______________________________________________<br>Thursday mailing list<br><a ymailto="mailto:Thursday@newsm.org" href="mailto:Thursday@newsm.org">Thursday@newsm.org</a><br><a href="http://newsm.org/mailman/listinfo/thursday_newsm.org" target="_blank">http://newsm.org/mailman/listinfo/thursday_newsm.org</a><br><blockquote></blockquote></blockquote></div>
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