[TXnMA]

Ah! "Induction Balance" -- still use by metal detectorists as a probe for pinpointing metal "finds", detected by their large-area "Metal Detectors"...

Thank you very much for following through on this!! That is a fascinating story!

FRegards,
TXnMA
 

[morphing libertarian]

Never knew much about Garfield till I saw this. Also learned something about Bell