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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: the shapes of his rectangles while preserving their areas constant,
and finds that the constant area produces always the same amount of
current per revolution. The current depends solely on the number of
lines of force intersected, and when this number is kept constant
the current remains constant too. Thus the lines of magnetic force
are continually before his eyes, by their aid he colligates his
facts, and through the inspirations derived from them he vastly
expands the boundaries of our experimental knowledge. The beauty
and exactitude of the results of this investigation are
extraordinary. I cannot help thinking while I dwell upon them, that
this discovery of magneto-electricity is the greatest experimental
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