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Build a DIY magnetometer with a couple of seasoning bottles

(spectrum.ieee.org)
96 points nullbyte808 | 2 comments | 29 Nov 25 12:04 UTC | HN request time: 0s | source
1. mcculley ◴[07 Dec 25 20:28 UTC] No.46184837[source]▶
Could one use something like this from the surface to detect steel submerged under 20-40 feet of water?
replies(1): >>46185002 #
2. sllabres ◴[07 Dec 25 20:47 UTC] No.46185002[source]▶
I think, not from the surface, but have a look here [1], where the author referenced from the IIEE article has build a submergible sensor and detected (a know) boat.

[1] https://alexmumm.de/pgProtonMagMarine_en.htm