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Re: non-potential voltage

I haven't read the paper.
But I expect the Faraday's law in question
is the Faraday-Neuman Law
E = -dPhi/dt

for phi magnetic flux

This is the first time I've heard the name Neuman (Neumann?)
associated with this equation. I've always parenthetically
noted that the minus sign is the expression of Lenz's law.
Who was Neuman and why is his name attached to this law
I've always attributed to Michael Faraday and Joseph Henry
(though I suspect neither expressed it mathematically)?

Leigh