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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: Incidental to the 'historic sketch,' he repeated almost all the
experiments there referred to; and these, added to his own
subsequent work, made him practical master of all that was then
known regarding the voltaic current. In 1821, he also touched upon
a subject which subsequently received his closer attention--the
vaporization of mercury at common temperatures; and immediately
afterwards conducted, in company with Mr. Stodart, experiments on
the alloys of steel. He was accustomed in after years to present to
his friends razors formed from one of the alloys then discovered.
During Faraday's hours of liberty from other duties, he took up
subjects of inquiry for himself; and in the spring of 1823, thus
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