Magnetism
and gravity
B, a strong
magnet set in the open slot between the sides of the wheel A, as shown
in the section. C, an iron ball. The magnet is supposed to draw the
ball to one side of the center, and gravity gives the ball the force to
turn the wheel. Patented in 1823. Section shows the ball and slot.
(Subsection 921-922, from
p.368)
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
