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:|
called a contact theory, which, while it takes into account the
action of the metals, also embraces the chemical phenomena of the
circuit. Helmholtz, I believe, was the first to give the contact
theory this new form, in his celebrated essay, Ueber die Erhaltung
der Kraft, p. 45.
Researches on frictional electricity: induction: conduction:
specific inductive capacity: theory of contiguous particles.
The burst of power which had filled the four preceding years with an
amount of experimental work unparalleled in the history of science