Self-moving
water power
An Archimedean
screw mounted with three water wheels, by its revolution pumps water
which falls consecutively upon the wheels, and gives the power required
to turn the screw. Seventeenth century.
(Subsection 949, from
p.380)
From: Gardner D. Hiscox, M.E., Mechanical Appliances and Novelties of Construction (1927), Norman W. Henley Publ. Co.
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
