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Re: [Phys-L] Finally shark mag. sensing proved.



On 2021/May/06, at 20:58, Brian Whatcott <betwys1@sbcglobal.net <mailto:betwys1@sbcglobal.net>> wrote:

Interesting! I may have mentioned visiting a researcher at MBL, Woods Hole long ago. He rigged a shark tank and found that his shark subjects had an exquisitely sensitive electric field sense. The kind that might prove helpful in locating fish. I don't think he connected that result to an (unsuccessful) experiment that Faraday ran in the Thames, to measure the electric filed at either side of a bridge there due to the tidal current. A direct magnetic sense seems more plausible than mapping the electrical effect of ocean currents in the geomagnetic field, certainly.
On Thursday, May 6, 2021, 06:37:44 PM CDT, bernard cleyet <bernard@cleyet.org <mailto:bernard@cleyet.org>> wrote:


probably his detector was too insensitive. Surely an effect w/ the rapidly flowing brine.


bc … never thought of it, but reminded of magnetohydrodynamic drive.

OTOH, what’s the separation of the cat and an ions?