" So too, little bits of stone and fossil,
dug out of the earth, intelligently interpreted, have issued in the
science of geology and the practical operations of mining, in which
large capitals are invested and vast numbers of persons profitably
employed.
The gigantic machinery employed in pumping our mines, working our
mills and manufactures, and driving our steam-ships and
locomotives, in like manner depends for its supply of power upon so
slight an agency as little drops of water expanded by heat,--that
familiar agency called steam, which we see issuing from that common
tea-kettle spout, but which, when put up within an ingeniously
contrived mechanism, displays a force equal to that of millions of
horses, and contains a power to rebuke the waves and set even the
hurricane at defiance. The same power at work within the bowels of
the earth has been the cause of those volcanoes and earthquakes
which have played so mighty a part in the history of the globe.
It is said that the Marquis of Worcester's attention was first
accidentally directed to the subject of steam power, by the tight
cover of a vessel containing hot water having been blown off before
his eyes, when confined a prisoner in the Tower. He published the
result of his observations in his 'Century of Inventions,' which
formed a sort of text-book for inquirers into the powers of steam
for a time, until Savary, Newcomen, and others, applying it to
practical purposes, brought the steam-engine to the state in which
Watt found it when called upon to repair a model of Newcomen's
engine, which belonged to the University of Glasgow.
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