. . . After trying
several experiments on surfaces of various shapes, he ascertained
the difference of resistance in different cases, suggested the
probable cause of these variations, and opened a large field for
future curious and useful speculation; useful it may be called, as
well as curious, because such knowledge applies immediately to the
wants and active business of life, to the construction of wind- and
water-mills, and to the extensive purposes of navigation. The theory
of philosophers and the practice of mechanics and seamen were, and
perhaps are still, at variance as to the manner in which sails of
wind-mills and of ships should be set. Dr. Hooke, in his day,
expressed "his surprise at the obstinacy of seamen in continuing,
after what appeared the clearest demonstration to the contrary, to
prefer what are called bellying or bunting sails, to such as are
hauled tight." The doctor said that he would, at some future time,
add the test of experiment to mathematical investigation in support
of his theory.
'It is remarkable that this test of experiment, when at length it
was applied, confirmed the truth of what the philosopher had
reprobated as an obstinate vulgar error.
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