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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: led Faraday to the discovery of the extra current, or the current
induced in the primary wire itself at the moments of making and
breaking contact, the phenomena of which he described and
illustrated in the beautiful and exhaustive paper referred to.
Seven-and-thirty years have passed since the discovery of
magneto-electricity; but, if we except the extra current, until
quite recently nothing of moment was added to the subject. Faraday
entertained the opinion that the discoverer of a great law or
principle had a right to the 'spoils'--this was his term--arising
from its illustration; and guided by the principle he had discovered,
his wonderful mind, aided by his wonderful ten fingers, overran in a
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