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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: water is flowing there electric currents should be formed. If a line
be imagined passing from Dover to Calais through the sea, and
returning through the land, beneath the water, to Dover, it traces
out a circuit of conducting matter one part of which, when the water
moves up or down the channel, is cutting the magnetic curves of the
earth, whilst the other is relatively at rest.... There is every
reason to believe that currents do run in the general direction of
the circuit described, either one way or the other, according as the
passage of the waters is up or down the channel.' This was written
before the submarine cable was thought of, and he once informed me
that actual observation upon that cable had been found to be in
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